Merge pull request #15 from chrislusf/master

sync
2020-09-17 10:29:32 +08:00
parent 23baa3c36c 5eee4983f3
commit f71f7fcf99
130 changed files with 4439 additions and 1438 deletions
--- a/README.md
+++ b/README.md
@@ -90,7 +90,7 @@ There is only 40 bytes of disk storage overhead for each file's metadata. It is

 SeaweedFS started by implementing [Facebook's Haystack design paper](http://www.usenix.org/event/osdi10/tech/full_papers/Beaver.pdf). Also, SeaweedFS implements erasure coding with ideas from [f4: Facebook’s Warm BLOB Storage System](https://www.usenix.org/system/files/conference/osdi14/osdi14-paper-muralidhar.pdf)

-On top of the object store, optional [Filer] can support directories and POSIX attributes. Filer is a separate linearly-scalable stateless server with customizable metadata stores, e.g., MySql, Postgres, Mongodb, Redis, Etcd, Cassandra, LevelDB, MemSql, TiDB, TiKV, CockroachDB, etc.
+On top of the object store, optional [Filer] can support directories and POSIX attributes. Filer is a separate linearly-scalable stateless server with customizable metadata stores, e.g., MySql, Postgres, Mongodb, Redis, Cassandra, Elastic Search, LevelDB, MemSql, TiDB, Etcd, CockroachDB, etc.

 [Back to TOC](#table-of-contents)

@@ -115,9 +115,10 @@ On top of the object store, optional [Filer] can support directories and POSIX a
 * [Filer server][Filer] provides "normal" directories and files via http.
 * [Super Large Files][SuperLargeFiles] stores large or super large files in tens of TB.
 * [Mount filer][Mount] reads and writes files directly as a local directory via FUSE.
+* [Active-Active Replication][ActiveActiveAsyncReplication] enables asynchronous one-way or two-way cross cluster continuous replication.
 * [Amazon S3 compatible API][AmazonS3API] accesses files with S3 tooling.
-* [Hadoop Compatible File System][Hadoop] accesses files from Hadoop/Spark/Flink/etc jobs.
-* [Async Backup To Cloud][BackupToCloud] has extremely fast local access and backups to Amazon S3, Google Cloud Storage, Azure, BackBlaze.
+* [Hadoop Compatible File System][Hadoop] accesses files from Hadoop/Spark/Flink/etc or even runs HBase.
+* [Async Replication To Cloud][BackupToCloud] has extremely fast local access and backups to Amazon S3, Google Cloud Storage, Azure, BackBlaze.
 * [WebDAV] accesses as a mapped drive on Mac and Windows, or from mobile devices.
 * [AES256-GCM Encrypted Storage][FilerDataEncryption] safely stores the encrypted data.
 * [File TTL][FilerTTL] automatically purges file metadata and actual file data.
@@ -127,7 +128,7 @@ On top of the object store, optional [Filer] can support directories and POSIX a
 [SuperLargeFiles]: https://github.com/chrislusf/seaweedfs/wiki/Data-Structure-for-Large-Files
 [Mount]: https://github.com/chrislusf/seaweedfs/wiki/FUSE-Mount
 [AmazonS3API]: https://github.com/chrislusf/seaweedfs/wiki/Amazon-S3-API
-[BackupToCloud]: https://github.com/chrislusf/seaweedfs/wiki/Backup-to-Cloud
+[BackupToCloud]: https://github.com/chrislusf/seaweedfs/wiki/Async-Replication-to-Cloud
 [Hadoop]: https://github.com/chrislusf/seaweedfs/wiki/Hadoop-Compatible-File-System
 [WebDAV]: https://github.com/chrislusf/seaweedfs/wiki/WebDAV
 [ErasureCoding]: https://github.com/chrislusf/seaweedfs/wiki/Erasure-coding-for-warm-storage
@@ -136,6 +137,7 @@ On top of the object store, optional [Filer] can support directories and POSIX a
 [FilerTTL]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Stores
 [VolumeServerTTL]: https://github.com/chrislusf/seaweedfs/wiki/Store-file-with-a-Time-To-Live
 [SeaweedFsCsiDriver]: https://github.com/seaweedfs/seaweedfs-csi-driver
+[ActiveActiveAsyncReplication]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Active-Active-cross-cluster-continuous-synchronization

 [Back to TOC](#table-of-contents)

@@ -365,7 +367,7 @@ The architectures are mostly the same. SeaweedFS aims to store and read files fa

 * SeaweedFS optimizes for small files, ensuring O(1) disk seek operation, and can also handle large files.
 * SeaweedFS statically assigns a volume id for a file. Locating file content becomes just a lookup of the volume id, which can be easily cached.
-* SeaweedFS Filer metadata store can be any well-known and proven data stores, e.g., Cassandra, Mongodb, Redis, Etcd, MySql, Postgres, MemSql, TiDB, CockroachDB, etc, and is easy to customized.
+* SeaweedFS Filer metadata store can be any well-known and proven data stores, e.g., Cassandra, Mongodb, Redis, Elastic Search, MySql, Postgres, MemSql, TiDB, CockroachDB, Etcd etc, and is easy to customized.
 * SeaweedFS Volume server also communicates directly with clients via HTTP, supporting range queries, direct uploads, etc.

 | System         | File Meta                       | File Content Read| POSIX  | REST API | Optimized for small files |
@@ -406,7 +408,7 @@ Ceph uses CRUSH hashing to automatically manage the data placement. SeaweedFS pl

 SeaweedFS is optimized for small files. Small files are stored as one continuous block of content, with at most 8 unused bytes between files. Small file access is O(1) disk read.

-SeaweedFS Filer uses off-the-shelf stores, such as MySql, Postgres, Mongodb, Redis, Etcd, Cassandra, MemSql, TiDB, CockroachCB, to manage file directories. These stores are proven, scalable, and easier to manage.
+SeaweedFS Filer uses off-the-shelf stores, such as MySql, Postgres, Mongodb, Redis, Elastic Search, Cassandra, MemSql, TiDB, CockroachCB, Etcd, to manage file directories. These stores are proven, scalable, and easier to manage.

 | SeaweedFS         | comparable to Ceph | advantage |
 | -------------  | ------------- | ---------------- |
--- a/docker/Dockerfile.go_build_large
+++ b/docker/Dockerfile.go_build_large
@@ -0,0 +1,35 @@
+FROM frolvlad/alpine-glibc as builder
+RUN apk add git go g++
+RUN mkdir -p /go/src/github.com/chrislusf/
+RUN git clone https://github.com/chrislusf/seaweedfs /go/src/github.com/chrislusf/seaweedfs
+RUN cd /go/src/github.com/chrislusf/seaweedfs/weed && go install -tags 5BytesOffset
+
+FROM alpine AS final
+LABEL author="Chris Lu"
+COPY --from=builder /root/go/bin/weed /usr/bin/
+RUN mkdir -p /etc/seaweedfs
+COPY --from=builder /go/src/github.com/chrislusf/seaweedfs/docker/filer.toml /etc/seaweedfs/filer.toml
+COPY --from=builder /go/src/github.com/chrislusf/seaweedfs/docker/entrypoint.sh /entrypoint.sh
+
+# volume server gprc port
+EXPOSE 18080
+# volume server http port
+EXPOSE 8080
+# filer server gprc port
+EXPOSE 18888
+# filer server http port
+EXPOSE 8888
+# master server shared gprc port
+EXPOSE 19333
+# master server shared http port
+EXPOSE 9333
+# s3 server http port
+EXPOSE 8333
+
+RUN mkdir -p /data/filerldb2
+
+VOLUME /data
+
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	github.com/Azure/azure-storage-blob-go v0.8.0
 	github.com/OneOfOne/xxhash v1.2.2
 	github.com/Shopify/sarama v1.23.1
-	github.com/aws/aws-sdk-go v1.23.13
+	github.com/aws/aws-sdk-go v1.33.5
 	github.com/buraksezer/consistent v0.0.0-20191006190839-693edf70fd72
 	github.com/cespare/xxhash v1.1.0
 	github.com/chrislusf/raft v1.0.1
@@ -24,10 +24,9 @@ require (
 	github.com/facebookgo/subset v0.0.0-20200203212716-c811ad88dec4 // indirect
 	github.com/frankban/quicktest v1.7.2 // indirect
 	github.com/go-redis/redis v6.15.7+incompatible
-	github.com/go-sql-driver/mysql v1.4.1
+	github.com/go-sql-driver/mysql v1.5.0
 	github.com/gocql/gocql v0.0.0-20190829130954-e163eff7a8c6
 	github.com/gogo/protobuf v1.2.2-0.20190730201129-28a6bbf47e48 // indirect
-	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
 	github.com/golang/protobuf v1.4.2
 	github.com/google/btree v1.0.0
 	github.com/google/uuid v1.1.1
@@ -36,6 +35,7 @@ require (
 	github.com/grpc-ecosystem/grpc-gateway v1.11.0 // indirect
 	github.com/hashicorp/golang-lru v0.5.3 // indirect
 	github.com/jcmturner/gofork v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.10
 	github.com/karlseguin/ccache v2.0.3+incompatible
 	github.com/karlseguin/expect v1.0.1 // indirect
 	github.com/klauspost/compress v1.10.9
@@ -48,6 +48,7 @@ require (
 	github.com/mattn/go-ieproxy v0.0.0-20190805055040-f9202b1cfdeb // indirect
 	github.com/mattn/go-runewidth v0.0.4 // indirect
 	github.com/nats-io/nats-server/v2 v2.0.4 // indirect
+	github.com/olivere/elastic/v7 v7.0.19
 	github.com/onsi/ginkgo v1.10.1 // indirect
 	github.com/onsi/gomega v1.7.0 // indirect
 	github.com/peterh/liner v1.1.0
@@ -63,7 +64,7 @@ require (
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/viper v1.4.0
 	github.com/streadway/amqp v0.0.0-20190827072141-edfb9018d271 // indirect
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.5.1
 	github.com/syndtr/goleveldb v1.0.0
 	github.com/tidwall/gjson v1.3.2
 	github.com/tidwall/match v1.0.1
@@ -76,7 +77,7 @@ require (
 	gocloud.dev/pubsub/natspubsub v0.16.0
 	gocloud.dev/pubsub/rabbitpubsub v0.16.0
 	golang.org/x/image v0.0.0-20200119044424-58c23975cae1 // indirect
-	golang.org/x/net v0.0.0-20190909003024-a7b16738d86b
+	golang.org/x/net v0.0.0-20200202094626-16171245cfb2
 	golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5
 	golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5
 	google.golang.org/api v0.9.0
--- a/go.sum
+++ b/go.sum
@@ -47,6 +47,8 @@ github.com/aws/aws-sdk-go v1.19.18/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpi
 github.com/aws/aws-sdk-go v1.19.45/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.23.13 h1:l/NG+mgQFRGG3dsFzEj0jw9JIs/zYdtU6MXhY1WIDmM=
 github.com/aws/aws-sdk-go v1.23.13/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.33.5 h1:p2fr1ryvNTU6avUWLI+/H7FGv0TBIjzVM5WDgXBBv4U=
+github.com/aws/aws-sdk-go v1.33.5/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
@@ -138,6 +140,8 @@ github.com/go-redis/redis v6.15.7+incompatible h1:3skhDh95XQMpnqeqNftPkQD9jL9e5e
 github.com/go-redis/redis v6.15.7+incompatible/go.mod h1:NAIEuMOZ/fxfXJIrKDQDz8wamY7mA7PouImQ2Jvg6kA=
 github.com/go-sql-driver/mysql v1.4.1 h1:g24URVg0OFbNUTx9qqY1IRZ9D9z3iPyi5zKhQZpNwpA=
 github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
+github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gobuffalo/attrs v0.0.0-20190224210810-a9411de4debd/go.mod h1:4duuawTqi2wkkpB4ePgWMaai6/Kc6WEz83bhFwpHzj0=
@@ -210,6 +214,8 @@ github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
+github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-replayers/grpcreplay v0.1.0 h1:eNb1y9rZFmY4ax45uEEECSa8fsxGRU+8Bil52ASAwic=
 github.com/google/go-replayers/grpcreplay v0.1.0/go.mod h1:8Ig2Idjpr6gifRd6pNVggX6TC1Zw6Jx74AKp7QNH2QE=
 github.com/google/go-replayers/httpreplay v0.1.0 h1:AX7FUb4BjrrzNvblr/OlgwrmFiep6soj5K2QSDW7BGk=
@@ -273,12 +279,16 @@ github.com/jcmturner/gofork v1.0.0/go.mod h1:MK8+TM0La+2rjBD4jE12Kj1pCCxK7d2LK/U
 github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5imkbgOkpRUYLnmbU7UEFbjtDA2hxJ1ichM=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
+github.com/jmespath/go-jmespath v0.3.0 h1:OS12ieG61fsCg5+qLJ+SsW9NicxNkg3b25OyT2yCeUc=
+github.com/jmespath/go-jmespath v0.3.0/go.mod h1:9QtRXoHjLGCJ5IBSaohpXITPlowMeeYCZ7fLUTSywik=
 github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
 github.com/jonboulle/clockwork v0.1.0 h1:VKV+ZcuP6l3yW9doeqz6ziZGgcynBVQO+obU0+0hcPo=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.7 h1:KfgG9LzI+pYjr4xvmz/5H4FXjokeP+rlHLhv3iH62Fo=
 github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
+github.com/json-iterator/go v1.1.10 h1:Kz6Cvnvv2wGdaG/V8yMvfkmNiXq9Ya2KUv4rouJJr68=
+github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/karlseguin/ccache v2.0.3+incompatible h1:j68C9tWOROiOLWTS/kCGg9IcJG+ACqn5+0+t8Oh83UU=
@@ -319,6 +329,8 @@ github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDe
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/mailru/easyjson v0.7.1 h1:mdxE1MF9o53iCb2Ghj1VfWvh7ZOwHpnVG/xwXrV90U8=
+github.com/mailru/easyjson v0.7.1/go.mod h1:KAzv3t3aY1NaHWoQz1+4F1ccyAH66Jk7yos7ldAVICs=
 github.com/markbates/oncer v0.0.0-20181203154359-bf2de49a0be2/go.mod h1:Ld9puTsIW75CHf65OeIOkyKbteujpZVXDpWK6YGZbxE=
 github.com/markbates/safe v1.0.1/go.mod h1:nAqgmRi7cY2nqMc92/bSEeQA+R4OheNU2T1kNSCBdG0=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
@@ -364,6 +376,8 @@ github.com/nats-io/nuid v1.0.1 h1:5iA8DT8V7q8WK2EScv2padNa/rTESc1KdnPw4TC2paw=
 github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OSON2c=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/olekukonko/tablewriter v0.0.0-20170122224234-a0225b3f23b5/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
+github.com/olivere/elastic/v7 v7.0.19 h1:w4F6JpqOISadhYf/n0NR1cNj73xHqh4pzPwD1Gkidts=
+github.com/olivere/elastic/v7 v7.0.19/go.mod h1:4Jqt5xvjqpjCqgnTcHwl3j8TLs8mvoOK8NYgo/qEOu4=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
@@ -373,6 +387,7 @@ github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.7.0 h1:XPnZz8VVBHjVsy1vzJmRwIcSwiUO+JFfrv/xGiigmME=
 github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+github.com/opentracing/opentracing-go v1.2.0/go.mod h1:GxEUsuufX4nBwe+T+Wl9TAgYrxe9dPLANfrWvHYVTgc=
 github.com/pelletier/go-toml v1.2.0 h1:T5zMGML61Wp+FlcbWjRDT7yAxhJNAiPPLOFECq181zc=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/pelletier/go-toml v1.4.0 h1:u3Z1r+oOXJIkxqw34zVhyPgjBsm6X2wn21NWs/HfSeg=
@@ -385,6 +400,8 @@ github.com/pierrec/lz4 v2.2.7+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/profile v1.2.1/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -433,6 +450,9 @@ github.com/sirupsen/logrus v1.4.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPx
 github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/smartystreets/assertions v1.1.1/go.mod h1:tcbTF8ujkAEcZ8TElKY+i30BzYlVhC/LOxJk7iOWnoo=
+github.com/smartystreets/go-aws-auth v0.0.0-20180515143844-0c1422d1fdb9/go.mod h1:SnhjPscd9TpLiy1LpzGSKh3bXCfxxXuqd9xmQJy3slM=
+github.com/smartystreets/gunit v1.3.4/go.mod h1:ZjM1ozSIMJlAz/ay4SG8PeKF00ckUp+zMHZXV9/bvak=
 github.com/soheilhy/cmux v0.1.4 h1:0HKaf1o97UwFjHH9o5XsHUOF+tqmdA7KEzXLpiyaw0E=
 github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
@@ -468,6 +488,8 @@ github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/syndtr/goleveldb v1.0.0 h1:fBdIW9lB4Iz0n9khmH8w27SJ3QEJ7+IgjPEwGSZiFdE=
 github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
 github.com/tidwall/gjson v1.3.2 h1:+7p3qQFaH3fOMXAJSrdZwGKcOO/lYdGS0HqGhPqDdTI=
@@ -508,6 +530,8 @@ go.opencensus.io v0.15.0/go.mod h1:UffZAU+4sDEINUGP/B7UfBBkq4fqLu9zXAX7ke6CHW0=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0 h1:C9hSCOW830chIVkdja34wa6Ky+IzWllkUinR+BtRZd4=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
+go.opencensus.io v0.22.4 h1:LYy1Hy3MJdrCdMwwzxA/dRok4ejH+RwNGbuoD9fCjto=
+go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.6.0 h1:Ezj3JGmsOnG1MoRWQkPBsKLe9DwWD9QeXzTRzzldNVk=
@@ -575,6 +599,8 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190909003024-a7b16738d86b h1:XfVGCX+0T4WOStkaOsJRllbsiImhB2jgVBGc9L0lPGc=
 golang.org/x/net v0.0.0-20190909003024-a7b16738d86b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200202094626-16171245cfb2 h1:CCH4IOTTfewWjGOlSp+zGcjutRKlBEZQ6wTn8ozI/nI=
+golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
--- a/k8s/seaweedfs/Chart.yaml
+++ b/k8s/seaweedfs/Chart.yaml
@@ -1,4 +1,4 @@
 apiVersion: v1
 description: SeaweedFS
 name: seaweedfs
-version: 1.92
+version: 1.99
--- a/k8s/seaweedfs/templates/filer-statefulset.yaml
+++ b/k8s/seaweedfs/templates/filer-statefulset.yaml
@@ -99,6 +99,9 @@ spec:
              {{- end }}
              filer \
              -port={{ .Values.filer.port }} \
+              {{- if .Values.filer.redirectOnRead }}
+              -redirectOnRead \
+              {{- end }}
              {{- if .Values.filer.disableHttp }}
              -disableHttp \
              {{- end }}
@@ -106,7 +109,24 @@ spec:
              -disableDirListing \
              {{- end }}
              -dirListLimit={{ .Values.filer.dirListLimit }} \
+              {{- if .Values.global.enableReplication }}
+              -defaultReplicaPlacement={{ .Values.global.replicationPlacment }} \
+              {{- else }}
+              -defaultReplicaPlacement={{ .Values.filer.defaultReplicaPlacement }} \
+              {{- end }}
+              {{- if .Values.filer.disableDirListing }}
+              -disableDirListing \
+              {{- end }}
+              {{- if .Values.filer.maxMB }}
+              -maxMB={{ .Values.filer.maxMB }} \
+              {{- end }}
+              {{- if .Values.filer.encryptVolumeData }}
+              -encryptVolumeData \
+              {{- end }}
              -ip=${POD_IP} \
+              {{- if gt (.Values.filer.replicas | int) 1 }}
+              -peers={{ range $index := until (.Values.filer.replicas | int) }}${SEAWEEDFS_FULLNAME}-filer-{{ $index }}.${SEAWEEDFS_FULLNAME}-filer:{{ $.Values.filer.port }}{{ if lt $index (sub ($.Values.filer.replicas | int) 1) }},{{ end }}{{ end }}
+              {{- end }}
              -master={{ range $index := until (.Values.master.replicas | int) }}${SEAWEEDFS_FULLNAME}-master-{{ $index }}.${SEAWEEDFS_FULLNAME}-master:{{ $.Values.master.port }}{{ if lt $index (sub ($.Values.master.replicas | int) 1) }},{{ end }}{{ end }}
          {{- if or (.Values.global.enableSecurity) (.Values.filer.extraVolumeMounts) }}    
          volumeMounts:
@@ -149,6 +169,7 @@ spec:
            periodSeconds: 15
            successThreshold: 1
            failureThreshold: 100
+            timeoutSeconds: 3
          livenessProbe:
            httpGet:
              path: /
@@ -158,6 +179,7 @@ spec:
            periodSeconds: 30
            successThreshold: 1
            failureThreshold: 5
+            timeoutSeconds: 3
          {{- if .Values.filer.resources }}
          resources:
            {{ tpl .Values.filer.resources . | nindent 12 | trim }}
--- a/k8s/seaweedfs/templates/master-statefulset.yaml
+++ b/k8s/seaweedfs/templates/master-statefulset.yaml
@@ -70,6 +70,12 @@ spec:
                  fieldPath: metadata.namespace
            - name: SEAWEEDFS_FULLNAME
              value: "{{ template "seaweedfs.name" . }}"
+            {{- if .Values.master.extraEnvironmentVars }}
+            {{- range $key, $value := .Values.master.extraEnvironmentVars }}
+            - name: {{ $key }}
+              value: {{ $value | quote }}
+            {{- end }}
+            {{- end }}
          command:
            - "/bin/sh"
            - "-ec"
@@ -84,6 +90,11 @@ spec:
              -port={{ .Values.master.port }} \
              -mdir=/data \
              -ip.bind={{ .Values.master.ipBind }} \
+              {{- if .Values.global.enableReplication }}
+              -defaultReplication={{ .Values.global.replicationPlacment }} \
+              {{- else }}
+              -defaultReplication={{ .Values.master.defaultReplication }} \
+              {{- end }}
              {{- if .Values.master.volumePreallocate }}
              -volumePreallocate \
              {{- end }}
@@ -94,6 +105,15 @@ spec:
              {{- if .Values.master.disableHttp }}
              -disableHttp \
              {{- end }}
+              {{- if .Values.master.pulseSeconds }}
+              -pulseSeconds={{ .Values.master.pulseSeconds }} \
+              {{- end }}
+              {{- if .Values.master.garbageThreshold }}
+              -garbageThreshold={{ .Values.master.garbageThreshold }} \
+              {{- end }}
+              {{- if .Values.master.metricsIntervalSec }}
+              -metrics.intervalSeconds={{ .Values.master.metricsIntervalSec }} \
+              {{- end }}
              -ip=${POD_NAME}.${SEAWEEDFS_FULLNAME}-master \
              -peers={{ range $index := until (.Values.master.replicas | int) }}${SEAWEEDFS_FULLNAME}-master-{{ $index }}.${SEAWEEDFS_FULLNAME}-master:{{ $.Values.master.port }}{{ if lt $index (sub ($.Values.master.replicas | int) 1) }},{{ end }}{{ end }}
          volumeMounts:
@@ -133,19 +153,21 @@ spec:
              path: /cluster/status
              port: {{ .Values.master.port }}
              scheme: HTTP
-            initialDelaySeconds: 5
-            periodSeconds: 15
+            initialDelaySeconds: 10
+            periodSeconds: 45
            successThreshold: 2
            failureThreshold: 100
+            timeoutSeconds: 5
          livenessProbe:
            httpGet:
              path: /cluster/status
              port: {{ .Values.master.port }}
              scheme: HTTP
            initialDelaySeconds: 20
-            periodSeconds: 10
+            periodSeconds: 30
            successThreshold: 1
-            failureThreshold: 6
+            failureThreshold: 4
+            timeoutSeconds: 5
          {{- if .Values.master.resources }}
          resources:
            {{ tpl .Values.master.resources . | nindent 12 | trim }}
--- a/k8s/seaweedfs/templates/s3-deployment.yaml
+++ b/k8s/seaweedfs/templates/s3-deployment.yaml
@@ -116,6 +116,7 @@ spec:
            periodSeconds: 15
            successThreshold: 1
            failureThreshold: 100
+            timeoutSeconds: 3
          livenessProbe:
            httpGet:
              path: /
@@ -125,6 +126,7 @@ spec:
            periodSeconds: 60
            successThreshold: 1
            failureThreshold: 20
+            timeoutSeconds: 3
          {{- if .Values.s3.resources }}
          resources:
            {{ tpl .Values.s3.resources . | nindent 12 | trim }}
--- a/k8s/seaweedfs/templates/seaweefs-grafana-dashboard.yaml
+++ b/k8s/seaweedfs/templates/seaweefs-grafana-dashboard.yaml
@@ -91,7 +91,7 @@ data:
              "thresholds": [],
              "timeFrom": null,
              "timeShift": null,
-              "title": "Filer Request Duration 95th percentile",
+              "title": "Filer Request Duration 80th percentile",
              "tooltip": {
                "msResolution": true,
                "shared": true,
@@ -1349,4 +1349,4 @@ data:
      "title": "SeaweedFS",
      "version": 3
    }
-{{- end }}
+{{- end }}
--- a/k8s/seaweedfs/templates/volume-statefulset.yaml
+++ b/k8s/seaweedfs/templates/volume-statefulset.yaml
@@ -12,6 +12,7 @@ metadata:
 spec:
  serviceName: {{ template "seaweedfs.name" . }}-volume
  replicas: {{ .Values.volume.replicas }}
+  podManagementPolicy: Parallel
  selector:
    matchLabels:
      app: {{ template "seaweedfs.name" . }}
@@ -33,7 +34,7 @@ spec:
      restartPolicy: {{ default .Values.global.restartPolicy .Values.volume.restartPolicy }}
      {{- if .Values.volume.tolerations }}
      tolerations:
-        {{ tpl .Values.volume.tolerations . | nindent 8 | trim }}
+      {{ tpl .Values.volume.tolerations . | nindent 8 | trim }}
      {{- end }}
      {{- if .Values.global.imagePullSecrets }}
      imagePullSecrets:
@@ -62,7 +63,7 @@ spec:
                fieldRef:
                  fieldPath: status.hostIP
            - name: SEAWEEDFS_FULLNAME
-              value: "{{ template "seaweedfs.name" . }}"                  
+              value: "{{ template "seaweedfs.name" . }}"
          command:
            - "/bin/sh"
            - "-ec"
@@ -91,6 +92,16 @@ spec:
                {{- if .Values.volume.imagesFixOrientation }}
                -images.fix.orientation \
                {{- end }}
+                {{- if .Values.volume.pulseSeconds }}
+                -pulseSeconds={{ .Values.volume.pulseSeconds }} \
+                {{- end }}
+                {{- if .Values.volume.index }}
+                -index={{ .Values.volume.index }} \
+                {{- end }}
+                {{- if .Values.volume.fileSizeLimitMB }}
+                -fileSizeLimitMB={{ .Values.volume.fileSizeLimitMB }} \
+                {{- end }}
+                -minFreeSpacePercent={{ .Values.volume.minFreeSpacePercent }} \
                -ip=${POD_NAME}.${SEAWEEDFS_FULLNAME}-volume \
                -compactionMBps={{ .Values.volume.compactionMBps }} \
                -mserver={{ range $index := until (.Values.master.replicas | int) }}${SEAWEEDFS_FULLNAME}-master-{{ $index }}.${SEAWEEDFS_FULLNAME}-master:{{ $.Values.master.port }}{{ if lt $index (sub ($.Values.master.replicas | int) 1) }},{{ end }}{{ end }}
@@ -131,19 +142,21 @@ spec:
              path: /status
              port: {{ .Values.volume.port }}
              scheme: HTTP
-            initialDelaySeconds: 5
-            periodSeconds: 15
+            initialDelaySeconds: 15
+            periodSeconds: 90
            successThreshold: 1
            failureThreshold: 100
+            timeoutSeconds: 5
          livenessProbe:
            httpGet:
              path: /status
              port: {{ .Values.volume.port }}
              scheme: HTTP
            initialDelaySeconds: 20
-            periodSeconds: 30
+            periodSeconds: 90
            successThreshold: 1
-            failureThreshold: 10
+            failureThreshold: 4
+            timeoutSeconds: 5
          {{- if .Values.volume.resources }}
          resources:
            {{ tpl .Values.volume.resources . | nindent 12 | trim }}
--- a/k8s/seaweedfs/values.yaml
+++ b/k8s/seaweedfs/values.yaml
@@ -4,7 +4,7 @@ global:
  registry: ""
  repository: ""
  imageName: chrislusf/seaweedfs
-  imageTag: "1.92"
+  imageTag: "1.99"
  imagePullPolicy: IfNotPresent
  imagePullSecrets: imagepullsecret
  restartPolicy: Always
@@ -14,6 +14,13 @@ global:
    enabled: false
    gatewayHost: null
    gatewayPort: null
+  # if enabled will use global.replicationPlacment and override master & filer defaultReplicaPlacement config
+  enableReplication: false
+  #  replication type is XYZ:
+  # X number of replica in other data centers
+  # Y number of replica in other racks in the same data center
+  # Z number of replica in other servers in the same rack
+  replicationPlacment: "001"

 image:
  registry: ""
@@ -31,8 +38,20 @@ master:
  grpcPort: 19333
  ipBind: "0.0.0.0"
  volumePreallocate: false
+  #Master stops directing writes to oversized volumes
  volumeSizeLimitMB: 30000
  loggingOverrideLevel: null
+  #number of seconds between heartbeats, default 5
+  pulseSeconds: null
+  #threshold to vacuum and reclaim spaces, default 0.3 (30%)
+  garbageThreshold: null
+  #Prometheus push interval in seconds, default 15
+  metricsIntervalSec: 15
+  #  replication type is XYZ:
+  # X number of replica in other data centers
+  # Y number of replica in other racks in the same data center
+  # Z number of replica in other servers in the same rack
+  defaultReplication: "000"

  # Disable http request, only gRpc operations are allowed
  disableHttp: false
@@ -87,6 +106,11 @@ master:
  # ref: https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/
  priorityClassName: ""

+  extraEnvironmentVars:
+    WEED_MASTER_VOLUME_GROWTH_COPY_1: 7
+    WEED_MASTER_VOLUME_GROWTH_COPY_2: 6
+    WEED_MASTER_VOLUME_GROWTH_COPY_3: 3
+    WEED_MASTER_VOLUME_GROWTH_COPY_OTHER: 1

 volume:
  enabled: true
@@ -100,9 +124,18 @@ volume:
  ipBind: "0.0.0.0"
  replicas: 1
  loggingOverrideLevel: null
+  # number of seconds between heartbeats, must be smaller than or equal to the master's setting
+  pulseSeconds: null
+  # Choose [memory|leveldb|leveldbMedium|leveldbLarge] mode for memory~performance balance., default memory
+  index: null
+  # limit file size to avoid out of memory, default 256mb
+  fileSizeLimitMB: null
+  # minimum free disk space(in percents). If free disk space lower this value - all volumes marks as ReadOnly
+  minFreeSpacePercent: 1
+

  # limit background compaction or copying speed in mega bytes per second
-  compactionMBps: "40"
+  compactionMBps: "50"

  # Directories to store data files. dir[,dir]... (default "/tmp")
  dir: "/data"
@@ -177,6 +210,20 @@ filer:
  port: 8888
  grpcPort: 18888
  loggingOverrideLevel: null
+  #  replication type is XYZ:
+  # X number of replica in other data centers
+  # Y number of replica in other racks in the same data center
+  # Z number of replica in other servers in the same rack
+  defaultReplicaPlacement: "000"
+  # turn off directory listing
+  disableDirListing: false
+  # split files larger than the limit, default 32
+  maxMB: null
+  # encrypt data on volume servers
+  encryptVolumeData: false
+
+  # Whether proxy or redirect to volume server during file GET request
+  redirectOnRead: false

  # Limit sub dir listing size (default 100000)
  dirListLimit: 100000
@@ -237,11 +284,6 @@ filer:
  # ref: https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/
  priorityClassName: ""

-  dbSchema:
-    imageName: db-schema
-    imageTag: "development"
-    imageOverride: ""
-
  # extraEnvVars is a list of extra enviroment variables to set with the stateful set.
  extraEnvironmentVars:
    WEED_MYSQL_ENABLED: "true"
@@ -260,6 +302,8 @@ filer:
    WEED_FILER_BUCKETS_FOLDER: "/buckets"
    # directories under this folder will be store message queue data
    WEED_FILER_QUEUES_FOLDER: "/queues"
+    # WEED_FILER_OPTIONS_BUCKETS_FSYNC a list of buckets names with all write requests fsync=true
+    WEED_FILER_OPTIONS_BUCKETS_FSYNC: []

 s3:
  enabled: true
--- a/other/java/client/pom.xml
+++ b/other/java/client/pom.xml
@@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.4.6</version>
+    <version>1.4.7</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
--- a/other/java/client/pom.xml.deploy
+++ b/other/java/client/pom.xml.deploy
@@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.4.6</version>
+    <version>1.4.7</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
--- a/other/java/client/pom_debug.xml
+++ b/other/java/client/pom_debug.xml
@@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.4.6</version>
+    <version>1.4.7</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -58,6 +58,12 @@ service SeaweedFiler {
    rpc LocateBroker (LocateBrokerRequest) returns (LocateBrokerResponse) {
    }

+    rpc KvGet (KvGetRequest) returns (KvGetResponse) {
+    }
+
+    rpc KvPut (KvPutRequest) returns (KvPutResponse) {
+    }
+
 }

 //////////////////////////////////////////////////
@@ -266,6 +272,7 @@ message GetFilerConfigurationResponse {
    uint32 max_mb = 4;
    string dir_buckets = 5;
    bool cipher = 7;
+    int32 signature = 8;
 }

 message SubscribeMetadataRequest {
@@ -307,3 +314,19 @@ message LocateBrokerResponse {
    }
    repeated Resource resources = 2;
 }
+
+// Key-Value operations
+message KvGetRequest {
+    bytes key = 1;
+}
+message KvGetResponse {
+    bytes value = 1;
+    string error = 2;
+}
+message KvPutRequest {
+    bytes key = 1;
+    bytes value = 2;
+}
+message KvPutResponse {
+    string error = 1;
+}
--- a/other/java/hdfs2/dependency-reduced-pom.xml
+++ b/other/java/hdfs2/dependency-reduced-pom.xml
@@ -301,7 +301,7 @@
    </snapshotRepository>
  </distributionManagement>
  <properties>
-    <seaweedfs.client.version>1.4.6</seaweedfs.client.version>
+    <seaweedfs.client.version>1.4.7</seaweedfs.client.version>
    <hadoop.version>2.9.2</hadoop.version>
  </properties>
 </project>
--- a/other/java/hdfs2/pom.xml
+++ b/other/java/hdfs2/pom.xml
@@ -5,7 +5,7 @@
    <modelVersion>4.0.0</modelVersion>

    <properties>
-        <seaweedfs.client.version>1.4.6</seaweedfs.client.version>
+        <seaweedfs.client.version>1.4.7</seaweedfs.client.version>
        <hadoop.version>2.9.2</hadoop.version>
    </properties>

--- a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
+++ b/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
@@ -5,7 +5,6 @@ import org.apache.hadoop.fs.*;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.util.Progressable;
 import org.slf4j.Logger;
@@ -14,20 +13,19 @@ import seaweedfs.client.FilerProto;

 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.URI;
 import java.util.EnumSet;
 import java.util.List;
 import java.util.Map;

-import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_KEY;
-
 public class SeaweedFileSystem extends FileSystem {

-    public static final int FS_SEAWEED_DEFAULT_PORT = 8888;
    public static final String FS_SEAWEED_FILER_HOST = "fs.seaweed.filer.host";
    public static final String FS_SEAWEED_FILER_PORT = "fs.seaweed.filer.port";
+    public static final int FS_SEAWEED_DEFAULT_PORT = 8888;
+    public static final String FS_SEAWEED_BUFFER_SIZE = "fs.seaweed.buffer.size";
+    public static final int FS_SEAWEED_DEFAULT_BUFFER_SIZE = 4 * 1024 * 1024;

    private static final Logger LOG = LoggerFactory.getLogger(SeaweedFileSystem.class);

@@ -75,8 +73,9 @@ public class SeaweedFileSystem extends FileSystem {
        path = qualify(path);

        try {
-            FSInputStream inputStream = seaweedFileSystemStore.openFileForRead(path, statistics, bufferSize);
-            return new FSDataInputStream(new BufferedFSInputStream(inputStream, 16 * 1024 * 1024));
+            int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
+            FSInputStream inputStream = seaweedFileSystemStore.openFileForRead(path, statistics, seaweedBufferSize);
+            return new FSDataInputStream(new BufferedFSInputStream(inputStream, 4 * seaweedBufferSize));
        } catch (Exception ex) {
            LOG.warn("open path: {} bufferSize:{}", path, bufferSize, ex);
            return null;
@@ -93,7 +92,8 @@ public class SeaweedFileSystem extends FileSystem {

        try {
            String replicaPlacement = String.format("%03d", replication - 1);
-            OutputStream outputStream = seaweedFileSystemStore.createFile(path, overwrite, permission, bufferSize, replicaPlacement);
+            int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
+            OutputStream outputStream = seaweedFileSystemStore.createFile(path, overwrite, permission, seaweedBufferSize, replicaPlacement);
            return new FSDataOutputStream(outputStream, statistics);
        } catch (Exception ex) {
            LOG.warn("create path: {} bufferSize:{} blockSize:{}", path, bufferSize, blockSize, ex);
@@ -103,8 +103,9 @@ public class SeaweedFileSystem extends FileSystem {

    /**
     * {@inheritDoc}
+     *
     * @throws FileNotFoundException if the parent directory is not present -or
-     * is not a directory.
+     *                               is not a directory.
     */
    @Override
    public FSDataOutputStream createNonRecursive(Path path,
@@ -121,9 +122,10 @@ public class SeaweedFileSystem extends FileSystem {
                throw new FileAlreadyExistsException("Not a directory: " + parent);
            }
        }
+        int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
        return create(path, permission,
                flags.contains(CreateFlag.OVERWRITE), bufferSize,
-                replication, blockSize, progress);
+                replication, seaweedBufferSize, progress);
    }

    @Override
@@ -133,7 +135,8 @@ public class SeaweedFileSystem extends FileSystem {

        path = qualify(path);
        try {
-            OutputStream outputStream = seaweedFileSystemStore.createFile(path, false, null, bufferSize, "");
+            int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
+            OutputStream outputStream = seaweedFileSystemStore.createFile(path, false, null, seaweedBufferSize, "");
            return new FSDataOutputStream(outputStream, statistics);
        } catch (Exception ex) {
            LOG.warn("append path: {} bufferSize:{}", path, bufferSize, ex);
@@ -338,9 +341,7 @@ public class SeaweedFileSystem extends FileSystem {

    @Override
    public void createSymlink(final Path target, final Path link,
-                              final boolean createParent) throws AccessControlException,
-            FileAlreadyExistsException, FileNotFoundException,
-            ParentNotDirectoryException, UnsupportedFileSystemException,
+                              final boolean createParent) throws
            IOException {
        // Supporting filesystems should override this method
        throw new UnsupportedOperationException(
--- a/other/java/hdfs3/dependency-reduced-pom.xml
+++ b/other/java/hdfs3/dependency-reduced-pom.xml
@@ -309,7 +309,7 @@
    </snapshotRepository>
  </distributionManagement>
  <properties>
-    <seaweedfs.client.version>1.4.6</seaweedfs.client.version>
+    <seaweedfs.client.version>1.4.7</seaweedfs.client.version>
    <hadoop.version>3.1.1</hadoop.version>
  </properties>
 </project>
--- a/other/java/hdfs3/pom.xml
+++ b/other/java/hdfs3/pom.xml
@@ -5,7 +5,7 @@
    <modelVersion>4.0.0</modelVersion>

    <properties>
-        <seaweedfs.client.version>1.4.6</seaweedfs.client.version>
+        <seaweedfs.client.version>1.4.7</seaweedfs.client.version>
        <hadoop.version>3.1.1</hadoop.version>
    </properties>

--- a/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
+++ b/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
@@ -5,7 +5,6 @@ import org.apache.hadoop.fs.*;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.util.Progressable;
 import org.slf4j.Logger;
@@ -14,20 +13,19 @@ import seaweedfs.client.FilerProto;

 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.URI;
 import java.util.EnumSet;
 import java.util.List;
 import java.util.Map;

-import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_KEY;
-
 public class SeaweedFileSystem extends FileSystem {

-    public static final int FS_SEAWEED_DEFAULT_PORT = 8888;
    public static final String FS_SEAWEED_FILER_HOST = "fs.seaweed.filer.host";
    public static final String FS_SEAWEED_FILER_PORT = "fs.seaweed.filer.port";
+    public static final int FS_SEAWEED_DEFAULT_PORT = 8888;
+    public static final String FS_SEAWEED_BUFFER_SIZE = "fs.seaweed.buffer.size";
+    public static final int FS_SEAWEED_DEFAULT_BUFFER_SIZE = 4 * 1024 * 1024;

    private static final Logger LOG = LoggerFactory.getLogger(SeaweedFileSystem.class);

@@ -75,8 +73,9 @@ public class SeaweedFileSystem extends FileSystem {
        path = qualify(path);

        try {
-            FSInputStream inputStream = seaweedFileSystemStore.openFileForRead(path, statistics, bufferSize);
-            return new FSDataInputStream(new BufferedFSInputStream(inputStream, 16 * 1024 * 1024));
+            int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
+            FSInputStream inputStream = seaweedFileSystemStore.openFileForRead(path, statistics, seaweedBufferSize);
+            return new FSDataInputStream(new BufferedFSInputStream(inputStream, 4 * seaweedBufferSize));
        } catch (Exception ex) {
            LOG.warn("open path: {} bufferSize:{}", path, bufferSize, ex);
            return null;
@@ -93,7 +92,8 @@ public class SeaweedFileSystem extends FileSystem {

        try {
            String replicaPlacement = String.format("%03d", replication - 1);
-            OutputStream outputStream = seaweedFileSystemStore.createFile(path, overwrite, permission, bufferSize, replicaPlacement);
+            int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
+            OutputStream outputStream = seaweedFileSystemStore.createFile(path, overwrite, permission, seaweedBufferSize, replicaPlacement);
            return new FSDataOutputStream(outputStream, statistics);
        } catch (Exception ex) {
            LOG.warn("create path: {} bufferSize:{} blockSize:{}", path, bufferSize, blockSize, ex);
@@ -103,8 +103,9 @@ public class SeaweedFileSystem extends FileSystem {

    /**
     * {@inheritDoc}
+     *
     * @throws FileNotFoundException if the parent directory is not present -or
-     * is not a directory.
+     *                               is not a directory.
     */
    @Override
    public FSDataOutputStream createNonRecursive(Path path,
@@ -121,9 +122,10 @@ public class SeaweedFileSystem extends FileSystem {
                throw new FileAlreadyExistsException("Not a directory: " + parent);
            }
        }
+        int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
        return create(path, permission,
                flags.contains(CreateFlag.OVERWRITE), bufferSize,
-                replication, blockSize, progress);
+                replication, seaweedBufferSize, progress);
    }

    @Override
@@ -133,7 +135,8 @@ public class SeaweedFileSystem extends FileSystem {

        path = qualify(path);
        try {
-            OutputStream outputStream = seaweedFileSystemStore.createFile(path, false, null, bufferSize, "");
+            int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
+            OutputStream outputStream = seaweedFileSystemStore.createFile(path, false, null, seaweedBufferSize, "");
            return new FSDataOutputStream(outputStream, statistics);
        } catch (Exception ex) {
            LOG.warn("append path: {} bufferSize:{}", path, bufferSize, ex);
@@ -338,9 +341,7 @@ public class SeaweedFileSystem extends FileSystem {

    @Override
    public void createSymlink(final Path target, final Path link,
-                              final boolean createParent) throws AccessControlException,
-            FileAlreadyExistsException, FileNotFoundException,
-            ParentNotDirectoryException, UnsupportedFileSystemException,
+                              final boolean createParent) throws
            IOException {
        // Supporting filesystems should override this method
        throw new UnsupportedOperationException(
--- a/test/s3/multipart/aws_upload.go
+++ b/test/s3/multipart/aws_upload.go
@@ -0,0 +1,175 @@
+package main
+
+// copied from https://github.com/apoorvam/aws-s3-multipart-upload
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/awserr"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+)
+
+const (
+	maxPartSize        = int64(5 * 1024 * 1024)
+	maxRetries         = 3
+	awsAccessKeyID     = "Your access key"
+	awsSecretAccessKey = "Your secret key"
+	awsBucketRegion    = "S3 bucket region"
+	awsBucketName      = "newBucket"
+)
+
+var (
+	filename = flag.String("f", "", "the file name")
+)
+
+func main() {
+	flag.Parse()
+
+	creds := credentials.NewStaticCredentials(awsAccessKeyID, awsSecretAccessKey, "")
+	_, err := creds.Get()
+	if err != nil {
+		fmt.Printf("bad credentials: %s", err)
+	}
+	cfg := aws.NewConfig().WithRegion(awsBucketRegion).WithCredentials(creds).WithDisableSSL(true).WithEndpoint("localhost:8333")
+	svc := s3.New(session.New(), cfg)
+
+	file, err := os.Open(*filename)
+	if err != nil {
+		fmt.Printf("err opening file: %s", err)
+		return
+	}
+	defer file.Close()
+	fileInfo, _ := file.Stat()
+	size := fileInfo.Size()
+	buffer := make([]byte, size)
+	fileType := http.DetectContentType(buffer)
+	file.Read(buffer)
+
+	path := "/media/" + file.Name()
+	input := &s3.CreateMultipartUploadInput{
+		Bucket:      aws.String(awsBucketName),
+		Key:         aws.String(path),
+		ContentType: aws.String(fileType),
+	}
+
+	resp, err := svc.CreateMultipartUpload(input)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	fmt.Println("Created multipart upload request")
+
+	var curr, partLength int64
+	var remaining = size
+	var completedParts []*s3.CompletedPart
+	partNumber := 1
+	for curr = 0; remaining != 0; curr += partLength {
+		if remaining < maxPartSize {
+			partLength = remaining
+		} else {
+			partLength = maxPartSize
+		}
+		completedPart, err := uploadPart(svc, resp, buffer[curr:curr+partLength], partNumber)
+		if err != nil {
+			fmt.Println(err.Error())
+			err := abortMultipartUpload(svc, resp)
+			if err != nil {
+				fmt.Println(err.Error())
+			}
+			return
+		}
+		remaining -= partLength
+		partNumber++
+		completedParts = append(completedParts, completedPart)
+	}
+
+	// list parts
+	parts, err := svc.ListParts(&s3.ListPartsInput{
+		Bucket:           input.Bucket,
+		Key:              input.Key,
+		MaxParts:         nil,
+		PartNumberMarker: nil,
+		RequestPayer:     nil,
+		UploadId:         resp.UploadId,
+	})
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+	fmt.Printf("list parts: %d\n", len(parts.Parts))
+	for i, part := range parts.Parts {
+		fmt.Printf("part %d: %v\n", i, part)
+	}
+
+
+	completeResponse, err := completeMultipartUpload(svc, resp, completedParts)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	fmt.Printf("Successfully uploaded file: %s\n", completeResponse.String())
+}
+
+func completeMultipartUpload(svc *s3.S3, resp *s3.CreateMultipartUploadOutput, completedParts []*s3.CompletedPart) (*s3.CompleteMultipartUploadOutput, error) {
+	completeInput := &s3.CompleteMultipartUploadInput{
+		Bucket:   resp.Bucket,
+		Key:      resp.Key,
+		UploadId: resp.UploadId,
+		MultipartUpload: &s3.CompletedMultipartUpload{
+			Parts: completedParts,
+		},
+	}
+	return svc.CompleteMultipartUpload(completeInput)
+}
+
+func uploadPart(svc *s3.S3, resp *s3.CreateMultipartUploadOutput, fileBytes []byte, partNumber int) (*s3.CompletedPart, error) {
+	tryNum := 1
+	partInput := &s3.UploadPartInput{
+		Body:          bytes.NewReader(fileBytes),
+		Bucket:        resp.Bucket,
+		Key:           resp.Key,
+		PartNumber:    aws.Int64(int64(partNumber)),
+		UploadId:      resp.UploadId,
+		ContentLength: aws.Int64(int64(len(fileBytes))),
+	}
+
+	for tryNum <= maxRetries {
+		uploadResult, err := svc.UploadPart(partInput)
+		if err != nil {
+			if tryNum == maxRetries {
+				if aerr, ok := err.(awserr.Error); ok {
+					return nil, aerr
+				}
+				return nil, err
+			}
+			fmt.Printf("Retrying to upload part #%v\n", partNumber)
+			tryNum++
+		} else {
+			fmt.Printf("Uploaded part #%v\n", partNumber)
+			return &s3.CompletedPart{
+				ETag:       uploadResult.ETag,
+				PartNumber: aws.Int64(int64(partNumber)),
+			}, nil
+		}
+	}
+	return nil, nil
+}
+
+func abortMultipartUpload(svc *s3.S3, resp *s3.CreateMultipartUploadOutput) error {
+	fmt.Println("Aborting multipart upload for UploadId#" + *resp.UploadId)
+	abortInput := &s3.AbortMultipartUploadInput{
+		Bucket:   resp.Bucket,
+		Key:      resp.Key,
+		UploadId: resp.UploadId,
+	}
+	_, err := svc.AbortMultipartUpload(abortInput)
+	return err
+}
--- a/unmaintained/diff_volume_servers/diff_volume_servers.go
+++ b/unmaintained/diff_volume_servers/diff_volume_servers.go
@@ -124,7 +124,9 @@ type needleState struct {
 func getVolumeFiles(v uint32, addr string) (map[types.NeedleId]needleState, int64, error) {
 	var idxFile *bytes.Reader
 	err := operation.WithVolumeServerClient(addr, grpcDialOption, func(vs volume_server_pb.VolumeServerClient) error {
-		copyFileClient, err := vs.CopyFile(context.Background(), &volume_server_pb.CopyFileRequest{
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+		copyFileClient, err := vs.CopyFile(ctx, &volume_server_pb.CopyFileRequest{
 			VolumeId:           v,
 			Ext:                ".idx",
 			CompactionRevision: math.MaxUint32,
--- a/weed/Makefile
+++ b/weed/Makefile
@@ -10,6 +10,10 @@ clean:
 	go clean $(SOURCE_DIR)
 	rm -f $(BINARY)

+debug_shell:
+	go build -gcflags="all=-N -l"
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- shell
+
 debug_mount:
 	go build -gcflags="all=-N -l"
 	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- mount -dir=~/tmp/mm
@@ -17,3 +21,7 @@ debug_mount:
 debug_server:
 	go build -gcflags="all=-N -l"
 	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- server -dir=/Volumes/mobile_disk/99 -filer -volume.port=8343 -s3 -volume.max=0
+
+debug_volume:
+	go build -gcflags="all=-N -l"
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- volume -dir=/Volumes/mobile_disk/100 -port 8564 -max=30 -preStopSeconds=2
--- a/weed/command/command.go
+++ b/weed/command/command.go
@@ -16,6 +16,7 @@ var Commands = []*Command{
 	cmdExport,
 	cmdFiler,
 	cmdFilerReplicate,
+	cmdFilerSynchronize,
 	cmdFix,
 	cmdMaster,
 	cmdMount,
--- a/weed/command/download.go
+++ b/weed/command/download.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"net/http"
 	"os"
 	"path"
 	"strings"
@@ -59,7 +60,7 @@ func downloadToFile(server, fileId, saveDir string) error {
 	if err != nil {
 		return err
 	}
-	defer rc.Close()
+	defer util.CloseResponse(rc)
 	if filename == "" {
 		filename = fileId
 	}
@@ -71,12 +72,11 @@ func downloadToFile(server, fileId, saveDir string) error {
 	}
 	f, err := os.OpenFile(path.Join(saveDir, filename), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm)
 	if err != nil {
-		io.Copy(ioutil.Discard, rc)
 		return err
 	}
 	defer f.Close()
 	if isFileList {
-		content, err := ioutil.ReadAll(rc)
+		content, err := ioutil.ReadAll(rc.Body)
 		if err != nil {
 			return err
 		}
@@ -95,7 +95,7 @@ func downloadToFile(server, fileId, saveDir string) error {
 			}
 		}
 	} else {
-		if _, err = io.Copy(f, rc); err != nil {
+		if _, err = io.Copy(f, rc.Body); err != nil {
 			return err
 		}

@@ -108,12 +108,12 @@ func fetchContent(server string, fileId string) (filename string, content []byte
 	if lookupError != nil {
 		return "", nil, lookupError
 	}
-	var rc io.ReadCloser
+	var rc *http.Response
 	if filename, _, rc, e = util.DownloadFile(fileUrl); e != nil {
 		return "", nil, e
 	}
-	content, e = ioutil.ReadAll(rc)
-	rc.Close()
+	defer util.CloseResponse(rc)
+	content, e = ioutil.ReadAll(rc.Body)
 	return
 }

--- a/weed/command/export.go
+++ b/weed/command/export.go
@@ -23,7 +23,7 @@ import (
 )

 const (
-	defaultFnFormat = `{{.Mime}}/{{.Id}}:{{.Name}}`
+	defaultFnFormat = `{{.Id}}_{{.Name}}{{.Ext}}`
 	timeFormat      = "2006-01-02T15:04:05"
 )

@@ -56,7 +56,7 @@ func init() {

 var (
 	output      = cmdExport.Flag.String("o", "", "output tar file name, must ends with .tar, or just a \"-\" for stdout")
-	format      = cmdExport.Flag.String("fileNameFormat", defaultFnFormat, "filename formatted with {{.Mime}} {{.Id}} {{.Name}} {{.Ext}}")
+	format      = cmdExport.Flag.String("fileNameFormat", defaultFnFormat, "filename formatted with {{.Id}} {{.Name}} {{.Ext}}")
 	newer       = cmdExport.Flag.String("newer", "", "export only files newer than this time, default is all files. Must be specified in RFC3339 without timezone, e.g. 2006-01-02T15:04:05")
 	showDeleted = cmdExport.Flag.Bool("deleted", false, "export deleted files. only applies if -o is not specified")
 	limit       = cmdExport.Flag.Int("limit", 0, "only show first n entries if specified")
@@ -70,13 +70,13 @@ var (
 	localLocation, _             = time.LoadLocation("Local")
 )

-func printNeedle(vid needle.VolumeId, n *needle.Needle, version needle.Version, deleted bool) {
+func printNeedle(vid needle.VolumeId, n *needle.Needle, version needle.Version, deleted bool, offset int64, onDiskSize int64) {
 	key := needle.NewFileIdFromNeedle(vid, n).String()
 	size := int32(n.DataSize)
 	if version == needle.Version1 {
 		size = int32(n.Size)
 	}
-	fmt.Printf("%s\t%s\t%d\t%t\t%s\t%s\t%s\t%t\n",
+	fmt.Printf("%s\t%s\t%d\t%t\t%s\t%s\t%s\t%t\t%d\t%d\n",
 		key,
 		n.Name,
 		size,
@@ -85,6 +85,8 @@ func printNeedle(vid needle.VolumeId, n *needle.Needle, version needle.Version,
 		n.LastModifiedString(),
 		n.Ttl.String(),
 		deleted,
+		offset,
+		offset+onDiskSize,
 	)
 }

@@ -111,7 +113,7 @@ func (scanner *VolumeFileScanner4Export) VisitNeedle(n *needle.Needle, offset in
 	nv, ok := needleMap.Get(n.Id)
 	glog.V(3).Infof("key %d offset %d size %d disk_size %d compressed %v ok %v nv %+v",
 		n.Id, offset, n.Size, n.DiskSize(scanner.version), n.IsCompressed(), ok, nv)
-	if ok && nv.Size.IsValid() && nv.Offset.ToAcutalOffset() == offset {
+	if *showDeleted && n.Size > 0 || ok && nv.Size.IsValid() && nv.Offset.ToAcutalOffset() == offset {
 		if newerThanUnix >= 0 && n.HasLastModifiedDate() && n.LastModified < uint64(newerThanUnix) {
 			glog.V(3).Infof("Skipping this file, as it's old enough: LastModified %d vs %d",
 				n.LastModified, newerThanUnix)
@@ -124,17 +126,17 @@ func (scanner *VolumeFileScanner4Export) VisitNeedle(n *needle.Needle, offset in
 		if tarOutputFile != nil {
 			return writeFile(vid, n)
 		} else {
-			printNeedle(vid, n, scanner.version, false)
+			printNeedle(vid, n, scanner.version, false, offset, n.DiskSize(scanner.version))
 			return nil
 		}
 	}
 	if !ok {
 		if *showDeleted && tarOutputFile == nil {
 			if n.DataSize > 0 {
-				printNeedle(vid, n, scanner.version, true)
+				printNeedle(vid, n, scanner.version, true, offset, n.DiskSize(scanner.version))
 			} else {
 				n.Name = []byte("*tombstone")
-				printNeedle(vid, n, scanner.version, true)
+				printNeedle(vid, n, scanner.version, true, offset, n.DiskSize(scanner.version))
 			}
 		}
 		glog.V(2).Infof("This seems deleted %d size %d", n.Id, n.Size)
@@ -208,7 +210,7 @@ func runExport(cmd *Command, args []string) bool {
 	}

 	if tarOutputFile == nil {
-		fmt.Printf("key\tname\tsize\tgzip\tmime\tmodified\tttl\tdeleted\n")
+		fmt.Printf("key\tname\tsize\tgzip\tmime\tmodified\tttl\tdeleted\tstart\tstop\n")
 	}

 	err = storage.ScanVolumeFile(util.ResolvePath(*export.dir), *export.collection, vid, storage.NeedleMapInMemory, volumeFileScanner)
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -152,7 +152,7 @@ func (fo *FilerOptions) startFiler() {

 	// starting grpc server
 	grpcPort := *fo.port + 10000
-	grpcL, err := util.NewListener(":"+strconv.Itoa(grpcPort), 0)
+	grpcL, err := util.NewListener(*fo.bindIp+":"+strconv.Itoa(grpcPort), 0)
 	if err != nil {
 		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
 	}
--- a/weed/command/filer_copy.go
+++ b/weed/command/filer_copy.go
@@ -72,7 +72,7 @@ var cmdCopy = &Command{

  If "maxMB" is set to a positive number, files larger than it would be split into chunks.

-  `,
+`,
 }

 func runCopy(cmd *Command, args []string) bool {
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@@ -0,0 +1,337 @@
+package command
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/replication"
+	"github.com/chrislusf/seaweedfs/weed/replication/sink/filersink"
+	"github.com/chrislusf/seaweedfs/weed/replication/source"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/chrislusf/seaweedfs/weed/util/grace"
+	"google.golang.org/grpc"
+	"io"
+	"strings"
+	"time"
+)
+
+type SyncOptions struct {
+	isActivePassive *bool
+	filerA          *string
+	filerB          *string
+	aPath           *string
+	bPath           *string
+	aReplication    *string
+	bReplication    *string
+	aCollection     *string
+	bCollection     *string
+	aTtlSec         *int
+	bTtlSec         *int
+	aDebug          *bool
+	bDebug          *bool
+}
+
+var (
+	syncOptions    SyncOptions
+	syncCpuProfile *string
+	syncMemProfile *string
+)
+
+func init() {
+	cmdFilerSynchronize.Run = runFilerSynchronize // break init cycle
+	syncOptions.isActivePassive = cmdFilerSynchronize.Flag.Bool("isActivePassive", false, "one directional follow if true")
+	syncOptions.filerA = cmdFilerSynchronize.Flag.String("a", "", "filer A in one SeaweedFS cluster")
+	syncOptions.filerB = cmdFilerSynchronize.Flag.String("b", "", "filer B in the other SeaweedFS cluster")
+	syncOptions.aPath = cmdFilerSynchronize.Flag.String("a.path", "/", "directory to sync on filer A")
+	syncOptions.bPath = cmdFilerSynchronize.Flag.String("b.path", "/", "directory to sync on filer B")
+	syncOptions.aReplication = cmdFilerSynchronize.Flag.String("a.replication", "", "replication on filer A")
+	syncOptions.bReplication = cmdFilerSynchronize.Flag.String("b.replication", "", "replication on filer B")
+	syncOptions.aCollection = cmdFilerSynchronize.Flag.String("a.collection", "", "collection on filer A")
+	syncOptions.bCollection = cmdFilerSynchronize.Flag.String("b.collection", "", "collection on filer B")
+	syncOptions.aTtlSec = cmdFilerSynchronize.Flag.Int("a.ttlSec", 0, "ttl in seconds on filer A")
+	syncOptions.bTtlSec = cmdFilerSynchronize.Flag.Int("b.ttlSec", 0, "ttl in seconds on filer B")
+	syncOptions.aDebug = cmdFilerSynchronize.Flag.Bool("a.debug", false, "debug mode to print out filer A received files")
+	syncOptions.bDebug = cmdFilerSynchronize.Flag.Bool("b.debug", false, "debug mode to print out filer B received files")
+	syncCpuProfile = cmdFilerSynchronize.Flag.String("cpuprofile", "", "cpu profile output file")
+	syncMemProfile = cmdFilerSynchronize.Flag.String("memprofile", "", "memory profile output file")
+}
+
+var cmdFilerSynchronize = &Command{
+	UsageLine: "filer.sync -a=<oneFilerHost>:<oneFilerPort> -b=<otherFilerHost>:<otherFilerPort>",
+	Short:     "continuously synchronize between two active-active or active-passive SeaweedFS clusters",
+	Long: `continuously synchronize file changes between two active-active or active-passive filers
+
+	filer.sync listens on filer notifications. If any file is updated, it will fetch the updated content,
+	and write to the other destination. Different from filer.replicate:
+
+	* filer.sync only works between two filers.
+	* filer.sync does not need any special message queue setup.
+	* filer.sync supports both active-active and active-passive modes.
+	
+	If restarted, the synchronization will resume from the previous checkpoints, persisted every minute.
+	A fresh sync will start from the earliest metadata logs.
+
+`,
+}
+
+func runFilerSynchronize(cmd *Command, args []string) bool {
+
+	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+
+	grace.SetupProfiling(*syncCpuProfile, *syncMemProfile)
+
+	go func() {
+		for {
+			err := doSubscribeFilerMetaChanges(grpcDialOption, *syncOptions.filerA, *syncOptions.aPath, *syncOptions.filerB,
+				*syncOptions.bPath, *syncOptions.bReplication, *syncOptions.bCollection, *syncOptions.bTtlSec, *syncOptions.bDebug)
+			if err != nil {
+				glog.Errorf("sync from %s to %s: %v", *syncOptions.filerA, *syncOptions.filerB, err)
+				time.Sleep(1747 * time.Millisecond)
+			}
+		}
+	}()
+
+	if !*syncOptions.isActivePassive {
+		go func() {
+			for {
+				err := doSubscribeFilerMetaChanges(grpcDialOption, *syncOptions.filerB, *syncOptions.bPath, *syncOptions.filerA,
+					*syncOptions.aPath, *syncOptions.aReplication, *syncOptions.aCollection, *syncOptions.aTtlSec, *syncOptions.aDebug)
+				if err != nil {
+					glog.Errorf("sync from %s to %s: %v", *syncOptions.filerB, *syncOptions.filerA, err)
+					time.Sleep(2147 * time.Millisecond)
+				}
+			}
+		}()
+	}
+
+	select {}
+
+	return true
+}
+
+func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, sourcePath, targetFiler, targetPath string,
+	replicationStr, collection string, ttlSec int, debug bool) error {
+
+	// read source filer signature
+	sourceFilerSignature, sourceErr := replication.ReadFilerSignature(grpcDialOption, sourceFiler)
+	if sourceErr != nil {
+		return sourceErr
+	}
+	// read target filer signature
+	targetFilerSignature, targetErr := replication.ReadFilerSignature(grpcDialOption, targetFiler)
+	if targetErr != nil {
+		return targetErr
+	}
+
+	// if first time, start from now
+	// if has previously synced, resume from that point of time
+	sourceFilerOffsetTsNs, err := readSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature)
+	if err != nil {
+		return err
+	}
+
+	glog.V(0).Infof("start sync %s(%d) => %s(%d) from %v(%d)", sourceFiler, sourceFilerSignature, targetFiler, targetFilerSignature, time.Unix(0, sourceFilerOffsetTsNs), sourceFilerOffsetTsNs)
+
+	// create filer sink
+	filerSource := &source.FilerSource{}
+	filerSource.DoInitialize(pb.ServerToGrpcAddress(sourceFiler), sourcePath)
+	filerSink := &filersink.FilerSink{}
+	filerSink.DoInitialize(pb.ServerToGrpcAddress(targetFiler), targetPath, replicationStr, collection, ttlSec, grpcDialOption)
+	filerSink.SetSourceFiler(filerSource)
+
+	processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+
+		var sourceOldKey, sourceNewKey util.FullPath
+		if message.OldEntry != nil {
+			sourceOldKey = util.FullPath(resp.Directory).Child(message.OldEntry.Name)
+		}
+		if message.NewEntry != nil {
+			sourceNewKey = util.FullPath(message.NewParentPath).Child(message.NewEntry.Name)
+		}
+
+		for _, sig := range message.Signatures {
+			if sig == targetFilerSignature && targetFilerSignature != 0 {
+				fmt.Printf("%s skipping %s change to %v\n", targetFiler, sourceFiler, message)
+				return nil
+			}
+		}
+		if debug {
+			fmt.Printf("%s check %s change %s,%s sig %v, target sig: %v\n", targetFiler, sourceFiler, sourceOldKey, sourceNewKey, message.Signatures, targetFilerSignature)
+		}
+
+		if !strings.HasPrefix(resp.Directory, sourcePath) {
+			return nil
+		}
+
+		// handle deletions
+		if message.OldEntry != nil && message.NewEntry == nil {
+			if !strings.HasPrefix(string(sourceOldKey), sourcePath) {
+				return nil
+			}
+			key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
+			return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
+		}
+
+		// handle new entries
+		if message.OldEntry == nil && message.NewEntry != nil {
+			if !strings.HasPrefix(string(sourceNewKey), sourcePath) {
+				return nil
+			}
+			key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
+			return filerSink.CreateEntry(key, message.NewEntry, message.Signatures)
+		}
+
+		// this is something special?
+		if message.OldEntry == nil && message.NewEntry == nil {
+			return nil
+		}
+
+		// handle updates
+		if strings.HasPrefix(string(sourceOldKey), sourcePath) {
+			// old key is in the watched directory
+			if strings.HasPrefix(string(sourceNewKey), sourcePath) {
+				// new key is also in the watched directory
+				oldKey := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
+				message.NewParentPath = util.Join(targetPath, message.NewParentPath[len(sourcePath):])
+				foundExisting, err := filerSink.UpdateEntry(string(oldKey), message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks, message.Signatures)
+				if foundExisting {
+					return err
+				}
+
+				// not able to find old entry
+				if err = filerSink.DeleteEntry(string(oldKey), message.OldEntry.IsDirectory, false, message.Signatures); err != nil {
+					return fmt.Errorf("delete old entry %v: %v", oldKey, err)
+				}
+
+				// create the new entry
+				newKey := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
+				return filerSink.CreateEntry(newKey, message.NewEntry, message.Signatures)
+
+			} else {
+				// new key is outside of the watched directory
+				key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
+				return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
+			}
+		} else {
+			// old key is outside of the watched directory
+			if strings.HasPrefix(string(sourceNewKey), sourcePath) {
+				// new key is in the watched directory
+				key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
+				return filerSink.CreateEntry(key, message.NewEntry, message.Signatures)
+			} else {
+				// new key is also outside of the watched directory
+				// skip
+			}
+		}
+
+		return nil
+	}
+
+	return pb.WithFilerClient(sourceFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
+			ClientName: "syncTo_" + targetFiler,
+			PathPrefix: sourcePath,
+			SinceNs:    sourceFilerOffsetTsNs,
+			Signature:  targetFilerSignature,
+		})
+		if err != nil {
+			return fmt.Errorf("listen: %v", err)
+		}
+
+		var counter int64
+		var lastWriteTime time.Time
+		for {
+			resp, listenErr := stream.Recv()
+			if listenErr == io.EOF {
+				return nil
+			}
+			if listenErr != nil {
+				return listenErr
+			}
+
+			if err := processEventFn(resp); err != nil {
+				return err
+			}
+
+			counter++
+			if lastWriteTime.Add(3 * time.Second).Before(time.Now()) {
+				glog.V(0).Infof("sync %s => %s progressed to %v %0.2f/sec", sourceFiler, targetFiler, time.Unix(0, resp.TsNs), float64(counter)/float64(3))
+				counter = 0
+				lastWriteTime = time.Now()
+				if err := writeSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature, resp.TsNs); err != nil {
+					return err
+				}
+			}
+
+		}
+
+	})
+
+}
+
+const (
+	SyncKeyPrefix = "sync."
+)
+
+func readSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32) (lastOffsetTsNs int64, readErr error) {
+
+	readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		syncKey := []byte(SyncKeyPrefix + "____")
+		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature))
+
+		resp, err := client.KvGet(context.Background(), &filer_pb.KvGetRequest{Key: syncKey})
+		if err != nil {
+			return err
+		}
+
+		if len(resp.Error) != 0 {
+			return errors.New(resp.Error)
+		}
+		if len(resp.Value) < 8 {
+			return nil
+		}
+
+		lastOffsetTsNs = int64(util.BytesToUint64(resp.Value))
+
+		return nil
+	})
+
+	return
+
+}
+
+func writeSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32, offsetTsNs int64) error {
+	return pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		syncKey := []byte(SyncKeyPrefix + "____")
+		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature))
+
+		valueBuf := make([]byte, 8)
+		util.Uint64toBytes(valueBuf, uint64(offsetTsNs))
+
+		resp, err := client.KvPut(context.Background(), &filer_pb.KvPutRequest{
+			Key:   syncKey,
+			Value: valueBuf,
+		})
+		if err != nil {
+			return err
+		}
+
+		if len(resp.Error) != 0 {
+			return errors.New(resp.Error)
+		}
+
+		return nil
+
+	})
+
+}
--- a/weed/command/mount.go
+++ b/weed/command/mount.go
@@ -20,6 +20,8 @@ type MountOptions struct {
 	umaskString                 *string
 	nonempty                    *bool
 	outsideContainerClusterMode *bool
+	uidMap                      *string
+	gidMap                      *string
 }

 var (
@@ -47,6 +49,8 @@ func init() {
 	mountCpuProfile = cmdMount.Flag.String("cpuprofile", "", "cpu profile output file")
 	mountMemProfile = cmdMount.Flag.String("memprofile", "", "memory profile output file")
 	mountOptions.outsideContainerClusterMode = cmdMount.Flag.Bool("outsideContainerClusterMode", false, "allows other users to access the file system")
+	mountOptions.uidMap = cmdMount.Flag.String("map.uid", "", "map local uid to uid on filer, comma-separated <local_uid>:<filer_uid>")
+	mountOptions.gidMap = cmdMount.Flag.String("map.gid", "", "map local gid to gid on filer, comma-separated <local_gid>:<filer_gid>")
 }

 var cmdMount = &Command{
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -5,6 +5,7 @@ package command
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
 	"os"
 	"os/user"
 	"path"
@@ -115,6 +116,13 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		}
 	}

+	// mapping uid, gid
+	uidGidMapper, err := meta_cache.NewUidGidMapper(*option.uidMap, *option.gidMap)
+	if err != nil {
+		fmt.Printf("failed to parse %s %s: %v\n", *option.uidMap, *option.gidMap, err)
+		return false
+	}
+
 	// Ensure target mount point availability
 	if isValid := checkMountPointAvailable(dir); !isValid {
 		glog.Fatalf("Expected mount to still be active, target mount point: %s, please check!", dir)
@@ -174,6 +182,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		Umask:                       umask,
 		OutsideContainerClusterMode: *mountOptions.outsideContainerClusterMode,
 		Cipher:                      cipher,
+		UidGidMapper:                uidGidMapper,
 	})

 	// mount
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -173,6 +173,20 @@ enabled = false
 uri = "mongodb://localhost:27017"
 option_pool_size = 0
 database = "seaweedfs"
+
+[elastic7]
+enabled = false
+servers = [
+    "http://localhost1:9200",
+    "http://localhost2:9200",
+    "http://localhost3:9200",
+]
+username = ""
+password = ""
+sniff_enabled = false
+healthcheck_enabled = false
+# increase the value is recommend, be sure the value in Elastic is greater or equal here
+index.max_result_window = 10000
 `

 	NOTIFICATION_TOML_EXAMPLE = `
@@ -377,7 +391,7 @@ default = "localhost:8888"    # used by maintenance scripts if the scripts needs


 [master.sequencer]
-type = "memory"     # Choose [memory|etcd] type for storing the file id sequence
+type = "raft"     # Choose [raft|etcd] type for storing the file id sequence
 # when sequencer.type = etcd, set listen client urls of etcd cluster that store file id sequence
 # example : http://127.0.0.1:2379,http://127.0.0.1:2389
 sequencer_etcd_urls = "http://127.0.0.1:2379"
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -98,7 +98,7 @@ func init() {
 	serverOptions.v.compactionMBPerSecond = cmdServer.Flag.Int("volume.compactionMBps", 0, "limit compaction speed in mega bytes per second")
 	serverOptions.v.fileSizeLimitMB = cmdServer.Flag.Int("volume.fileSizeLimitMB", 1024, "limit file size to avoid out of memory")
 	serverOptions.v.publicUrl = cmdServer.Flag.String("volume.publicUrl", "", "publicly accessible address")
-	serverOptions.v.preStopSeconds = cmdServer.Flag.Int("volume.preStopSeconds", 30, "number of seconds between stop send heartbeats and stop volume server")
+	serverOptions.v.preStopSeconds = cmdServer.Flag.Int("volume.preStopSeconds", 10, "number of seconds between stop send heartbeats and stop volume server")
 	serverOptions.v.pprof = &False

 	s3Options.port = cmdServer.Flag.Int("s3.port", 8333, "s3 server http listen port")
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -67,7 +67,7 @@ func init() {
 	v.publicUrl = cmdVolume.Flag.String("publicUrl", "", "Publicly accessible address")
 	v.bindIp = cmdVolume.Flag.String("ip.bind", "0.0.0.0", "ip address to bind to")
 	v.masters = cmdVolume.Flag.String("mserver", "localhost:9333", "comma-separated master servers")
-	v.preStopSeconds = cmdVolume.Flag.Int("preStopSeconds", 30, "number of seconds between stop send heartbeats and stop volume server")
+	v.preStopSeconds = cmdVolume.Flag.Int("preStopSeconds", 10, "number of seconds between stop send heartbeats and stop volume server")
 	// v.pulseSeconds = cmdVolume.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats, must be smaller than or equal to the master's setting")
 	v.idleConnectionTimeout = cmdVolume.Flag.Int("idleTimeout", 30, "connection idle seconds")
 	v.dataCenter = cmdVolume.Flag.String("dataCenter", "", "current volume server's data center name")
@@ -223,52 +223,48 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 	// starting the cluster http server
 	clusterHttpServer := v.startClusterHttpService(volumeMux)

-	stopChain := make(chan struct{})
+	stopChan := make(chan bool)
 	grace.OnInterrupt(func() {
 		fmt.Println("volume server has be killed")
-		var startTime time.Time

 		// Stop heartbeats
-		glog.V(0).Infof("stop send heartbeat and wait %d seconds until shutdown ...", *v.preStopSeconds)
-		volumeServer.SendHeartbeat = false
-		time.Sleep(time.Duration(*v.preStopSeconds) * time.Second)
-		glog.V(0).Infof("end sleep %d sec", *v.preStopSeconds)
-		// firstly, stop the public http service to prevent from receiving new user request
-		if nil != publicHttpDown {
-			startTime = time.Now()
-			if err := publicHttpDown.Stop(); err != nil {
-				glog.Warningf("stop the public http server failed, %v", err)
-			}
-			delta := time.Now().Sub(startTime).Nanoseconds() / 1e6
-			glog.V(0).Infof("stop public http server, elapsed %dms", delta)
+		if !volumeServer.StopHeartbeat() {
+			glog.V(0).Infof("stop send heartbeat and wait %d seconds until shutdown ...", *v.preStopSeconds)
+			time.Sleep(time.Duration(*v.preStopSeconds) * time.Second)
 		}

-		startTime = time.Now()
-		if err := clusterHttpServer.Stop(); err != nil {
-			glog.Warningf("stop the cluster http server failed, %v", err)
-		}
-		delta := time.Now().Sub(startTime).Nanoseconds() / 1e6
-		glog.V(0).Infof("graceful stop cluster http server, elapsed [%d]", delta)
-
-		startTime = time.Now()
-		grpcS.GracefulStop()
-		delta = time.Now().Sub(startTime).Nanoseconds() / 1e6
-		glog.V(0).Infof("graceful stop gRPC, elapsed [%d]", delta)
-
-		startTime = time.Now()
-		volumeServer.Shutdown()
-		delta = time.Now().Sub(startTime).Nanoseconds() / 1e6
-		glog.V(0).Infof("stop volume server, elapsed [%d]", delta)
-
-		pprof.StopCPUProfile()
-
-		close(stopChain) // notify exit
+		shutdown(publicHttpDown, clusterHttpServer, grpcS, volumeServer)
+		stopChan <- true
 	})

 	select {
-	case <-stopChain:
+	case <-stopChan:
 	}
-	glog.Warningf("the volume server exit.")
+
+}
+
+func shutdown(publicHttpDown httpdown.Server, clusterHttpServer httpdown.Server, grpcS *grpc.Server, volumeServer *weed_server.VolumeServer) {
+
+	// firstly, stop the public http service to prevent from receiving new user request
+	if nil != publicHttpDown {
+		glog.V(0).Infof("stop public http server ... ")
+		if err := publicHttpDown.Stop(); err != nil {
+			glog.Warningf("stop the public http server failed, %v", err)
+		}
+	}
+
+	glog.V(0).Infof("graceful stop cluster http server ... ")
+	if err := clusterHttpServer.Stop(); err != nil {
+		glog.Warningf("stop the cluster http server failed, %v", err)
+	}
+
+	glog.V(0).Infof("graceful stop gRPC ...")
+	grpcS.GracefulStop()
+
+	volumeServer.Shutdown()
+
+	pprof.StopCPUProfile()
+
 }

 // check whether configure the public port
--- a/weed/command/watch.go
+++ b/weed/command/watch.go
@@ -78,7 +78,10 @@ func runWatch(cmd *Command, args []string) bool {

 	watchErr := pb.WithFilerClient(*watchFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {

-		stream, err := client.SubscribeMetadata(context.Background(), &filer_pb.SubscribeMetadataRequest{
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
 			ClientName: "watch",
 			PathPrefix: *watchTarget,
 			SinceNs:    time.Now().Add(-*watchStart).UnixNano(),
@@ -98,7 +101,7 @@ func runWatch(cmd *Command, args []string) bool {
 			if !shouldPrint(resp) {
 				continue
 			}
-			fmt.Printf("%+v\n", resp.EventNotification)
+			fmt.Printf("dir:%s %+v\n", resp.Directory, resp.EventNotification)
 		}

 	})
--- a/weed/filer/abstract_sql/abstract_sql_store.go
+++ b/weed/filer/abstract_sql/abstract_sql_store.go
@@ -67,15 +67,21 @@ func (store *AbstractSqlStore) InsertEntry(ctx context.Context, entry *filer.Ent
 		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
 	}

+	if len(entry.Chunks) > 50 {
+		meta = util.MaybeGzipData(meta)
+	}
+
 	res, err := store.getTxOrDB(ctx).ExecContext(ctx, store.SqlInsert, util.HashStringToLong(dir), name, dir, meta)
-	if err != nil {
-		if !strings.Contains(strings.ToLower(err.Error()), "duplicate") {
-			return fmt.Errorf("kv insert: %s", err)
-		}
+	if err == nil {
+		return
+	}
+
+	if !strings.Contains(strings.ToLower(err.Error()), "duplicate") {
+		return fmt.Errorf("kv insert: %s", err)
 	}

 	// now the insert failed possibly due to duplication constraints
-	glog.V(1).Infof("insert %s falls back to update: %s", entry.FullPath, err)
+	glog.V(1).Infof("insert %s falls back to update: %v", entry.FullPath, err)

 	res, err = store.getTxOrDB(ctx).ExecContext(ctx, store.SqlUpdate, meta, util.HashStringToLong(dir), name, dir)
 	if err != nil {
@@ -126,7 +132,7 @@ func (store *AbstractSqlStore) FindEntry(ctx context.Context, fullpath util.Full
 	entry := &filer.Entry{
 		FullPath: fullpath,
 	}
-	if err := entry.DecodeAttributesAndChunks(data); err != nil {
+	if err := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}

@@ -171,7 +177,7 @@ func (store *AbstractSqlStore) ListDirectoryPrefixedEntries(ctx context.Context,
 		sqlText = store.SqlListInclusive
 	}

-	rows, err := store.getTxOrDB(ctx).QueryContext(ctx, sqlText, util.HashStringToLong(string(fullpath)), startFileName, string(fullpath), prefix, limit)
+	rows, err := store.getTxOrDB(ctx).QueryContext(ctx, sqlText, util.HashStringToLong(string(fullpath)), startFileName, string(fullpath), prefix+"%", limit)
 	if err != nil {
 		return nil, fmt.Errorf("list %s : %v", fullpath, err)
 	}
@@ -188,7 +194,7 @@ func (store *AbstractSqlStore) ListDirectoryPrefixedEntries(ctx context.Context,
 		entry := &filer.Entry{
 			FullPath: util.NewFullPath(string(fullpath), name),
 		}
-		if err = entry.DecodeAttributesAndChunks(data); err != nil {
+		if err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
 			glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err)
 			return nil, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
 		}
--- a/weed/filer/cassandra/cassandra_store.go
+++ b/weed/filer/cassandra/cassandra_store.go
@@ -60,6 +60,10 @@ func (store *CassandraStore) InsertEntry(ctx context.Context, entry *filer.Entry
 		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
 	}

+	if len(entry.Chunks) > 50 {
+		meta = util.MaybeGzipData(meta)
+	}
+
 	if err := store.session.Query(
 		"INSERT INTO filemeta (directory,name,meta) VALUES(?,?,?) USING TTL ? ",
 		dir, name, meta, entry.TtlSec).Exec(); err != nil {
@@ -93,7 +97,7 @@ func (store *CassandraStore) FindEntry(ctx context.Context, fullpath util.FullPa
 	entry = &filer.Entry{
 		FullPath: fullpath,
 	}
-	err = entry.DecodeAttributesAndChunks(data)
+	err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
@@ -144,7 +148,7 @@ func (store *CassandraStore) ListDirectoryEntries(ctx context.Context, fullpath
 		entry := &filer.Entry{
 			FullPath: util.NewFullPath(string(fullpath), name),
 		}
-		if decodeErr := entry.DecodeAttributesAndChunks(data); decodeErr != nil {
+		if decodeErr := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); decodeErr != nil {
 			err = decodeErr
 			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
 			break
--- a/weed/filer/cassandra/cassandra_store_kv.go
+++ b/weed/filer/cassandra/cassandra_store_kv.go
@@ -2,17 +2,60 @@ package cassandra

 import (
 	"context"
+	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/gocql/gocql"
 )

 func (store *CassandraStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
-	return filer.ErrKvNotImplemented
+	dir, name := genDirAndName(key)
+
+	if err := store.session.Query(
+		"INSERT INTO filemeta (directory,name,meta) VALUES(?,?,?) USING TTL ? ",
+		dir, name, value, 0).Exec(); err != nil {
+		return fmt.Errorf("kv insert: %s", err)
+	}
+
+	return nil
 }

-func (store *CassandraStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
-	return nil, filer.ErrKvNotImplemented
+func (store *CassandraStore) KvGet(ctx context.Context, key []byte) (data []byte, err error) {
+	dir, name := genDirAndName(key)
+
+	if err := store.session.Query(
+		"SELECT meta FROM filemeta WHERE directory=? AND name=?",
+		dir, name).Consistency(gocql.One).Scan(&data); err != nil {
+		if err != gocql.ErrNotFound {
+			return nil, filer.ErrKvNotFound
+		}
+	}
+
+	if len(data) == 0 {
+		return nil, filer.ErrKvNotFound
+	}
+
+	return data, nil
 }

 func (store *CassandraStore) KvDelete(ctx context.Context, key []byte) (err error) {
-	return filer.ErrKvNotImplemented
+	dir, name := genDirAndName(key)
+
+	if err := store.session.Query(
+		"DELETE FROM filemeta WHERE directory=? AND name=?",
+		dir, name).Exec(); err != nil {
+		return fmt.Errorf("kv delete: %v", err)
+	}
+
+	return nil
+}
+
+func genDirAndName(key []byte) (dir string, name string) {
+	for len(key) < 8 {
+		key = append(key, 0)
+	}
+
+	dir = string(key[:8])
+	name = string(key[8:])
+
+	return
 }
--- a/weed/filer/elastic/v7/elastic_store.go
+++ b/weed/filer/elastic/v7/elastic_store.go
@@ -0,0 +1,338 @@
+package elastic
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"strings"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	weed_util "github.com/chrislusf/seaweedfs/weed/util"
+	jsoniter "github.com/json-iterator/go"
+	elastic "github.com/olivere/elastic/v7"
+)
+
+var (
+	indexType   = "_doc"
+	indexPrefix = ".seaweedfs_"
+	indexKV     = ".seaweedfs_kv_entries"
+	kvMappings  = ` {
+		     "mappings": {
+		   	"enabled": false,
+		       "properties": {
+		         "Value":{
+		           "type": "binary"
+		         }
+		       }
+		     }
+		   }`
+)
+
+type ESEntry struct {
+	ParentId string `json:"ParentId"`
+	Entry    *filer.Entry
+}
+
+type ESKVEntry struct {
+	Value []byte `json:"Value"`
+}
+
+func init() {
+	filer.Stores = append(filer.Stores, &ElasticStore{})
+}
+
+type ElasticStore struct {
+	client      *elastic.Client
+	maxPageSize int
+}
+
+func (store *ElasticStore) GetName() string {
+	return "elastic7"
+}
+
+func (store *ElasticStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
+	options := []elastic.ClientOptionFunc{}
+	servers := configuration.GetStringSlice(prefix + "servers")
+	options = append(options, elastic.SetURL(servers...))
+	username := configuration.GetString(prefix + "username")
+	password := configuration.GetString(prefix + "password")
+	if username != "" && password != "" {
+		options = append(options, elastic.SetBasicAuth(username, password))
+	}
+	options = append(options, elastic.SetSniff(configuration.GetBool(prefix+"sniff_enabled")))
+	options = append(options, elastic.SetHealthcheck(configuration.GetBool(prefix+"healthcheck_enabled")))
+	store.maxPageSize = configuration.GetInt(prefix + "index.max_result_window")
+	if store.maxPageSize <= 0 {
+		store.maxPageSize = 10000
+	}
+	glog.Infof("filer store elastic endpoints: %v.", servers)
+	return store.initialize(options)
+}
+
+func (store *ElasticStore) initialize(options []elastic.ClientOptionFunc) (err error) {
+	ctx := context.Background()
+	store.client, err = elastic.NewClient(options...)
+	if err != nil {
+		return fmt.Errorf("init elastic %v.", err)
+	}
+	if ok, err := store.client.IndexExists(indexKV).Do(ctx); err == nil && !ok {
+		_, err = store.client.CreateIndex(indexKV).Body(kvMappings).Do(ctx)
+		if err != nil {
+			return fmt.Errorf("create index(%s) %v.", indexKV, err)
+		}
+	}
+	return nil
+}
+
+func (store *ElasticStore) BeginTransaction(ctx context.Context) (context.Context, error) {
+	return ctx, nil
+}
+func (store *ElasticStore) CommitTransaction(ctx context.Context) error {
+	return nil
+}
+func (store *ElasticStore) RollbackTransaction(ctx context.Context) error {
+	return nil
+}
+
+func (store *ElasticStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
+	return nil, filer.ErrUnsupportedListDirectoryPrefixed
+}
+
+func (store *ElasticStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
+	index := getIndex(entry.FullPath)
+	dir, _ := entry.FullPath.DirAndName()
+	id := weed_util.Md5String([]byte(entry.FullPath))
+	esEntry := &ESEntry{
+		ParentId: weed_util.Md5String([]byte(dir)),
+		Entry:    entry,
+	}
+	value, err := jsoniter.Marshal(esEntry)
+	if err != nil {
+		glog.Errorf("insert entry(%s) %v.", string(entry.FullPath), err)
+		return fmt.Errorf("insert entry %v.", err)
+	}
+	_, err = store.client.Index().
+		Index(index).
+		Type(indexType).
+		Id(id).
+		BodyJson(string(value)).
+		Do(ctx)
+	if err != nil {
+		glog.Errorf("insert entry(%s) %v.", string(entry.FullPath), err)
+		return fmt.Errorf("insert entry %v.", err)
+	}
+	return nil
+}
+
+func (store *ElasticStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *ElasticStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
+	index := getIndex(fullpath)
+	id := weed_util.Md5String([]byte(fullpath))
+	searchResult, err := store.client.Get().
+		Index(index).
+		Type(indexType).
+		Id(id).
+		Do(ctx)
+	if elastic.IsNotFound(err) {
+		return nil, filer_pb.ErrNotFound
+	}
+	if searchResult != nil && searchResult.Found {
+		esEntry := &ESEntry{
+			ParentId: "",
+			Entry:    &filer.Entry{},
+		}
+		err := jsoniter.Unmarshal(searchResult.Source, esEntry)
+		return esEntry.Entry, err
+	}
+	glog.Errorf("find entry(%s),%v.", string(fullpath), err)
+	return nil, filer_pb.ErrNotFound
+}
+
+func (store *ElasticStore) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
+	index := getIndex(fullpath)
+	id := weed_util.Md5String([]byte(fullpath))
+	if strings.Count(string(fullpath), "/") == 1 {
+		return store.deleteIndex(ctx, index)
+	}
+	return store.deleteEntry(ctx, index, id)
+}
+
+func (store *ElasticStore) deleteIndex(ctx context.Context, index string) (err error) {
+	deleteResult, err := store.client.DeleteIndex(index).Do(ctx)
+	if elastic.IsNotFound(err) || (err == nil && deleteResult.Acknowledged) {
+		return nil
+	}
+	glog.Errorf("delete index(%s) %v.", index, err)
+	return err
+}
+
+func (store *ElasticStore) deleteEntry(ctx context.Context, index, id string) (err error) {
+	deleteResult, err := store.client.Delete().
+		Index(index).
+		Type(indexType).
+		Id(id).
+		Do(ctx)
+	if err == nil {
+		if deleteResult.Result == "deleted" || deleteResult.Result == "not_found" {
+			return nil
+		}
+	}
+	glog.Errorf("delete entry(index:%s,_id:%s) %v.", index, id, err)
+	return fmt.Errorf("delete entry %v.", err)
+}
+
+func (store *ElasticStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
+	if entries, err := store.ListDirectoryEntries(ctx, fullpath, "", false, math.MaxInt32); err == nil {
+		for _, entry := range entries {
+			store.DeleteEntry(ctx, entry.FullPath)
+		}
+	}
+	return nil
+}
+
+func (store *ElasticStore) ListDirectoryEntries(
+	ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int,
+) (entries []*filer.Entry, err error) {
+	if string(fullpath) == "/" {
+		return store.listRootDirectoryEntries(ctx, startFileName, inclusive, limit)
+	}
+	return store.listDirectoryEntries(ctx, fullpath, startFileName, inclusive, limit)
+}
+
+func (store *ElasticStore) listRootDirectoryEntries(ctx context.Context, startFileName string, inclusive bool, limit int) (entries []*filer.Entry, err error) {
+	indexResult, err := store.client.CatIndices().Do(ctx)
+	if err != nil {
+		glog.Errorf("list indices %v.", err)
+		return entries, err
+	}
+	for _, index := range indexResult {
+		if index.Index == indexKV {
+			continue
+		}
+		if strings.HasPrefix(index.Index, indexPrefix) {
+			if entry, err := store.FindEntry(ctx,
+				weed_util.FullPath("/"+strings.Replace(index.Index, indexPrefix, "", 1))); err == nil {
+				fileName := getFileName(entry.FullPath)
+				if fileName == startFileName && !inclusive {
+					continue
+				}
+				limit--
+				if limit < 0 {
+					break
+				}
+				entries = append(entries, entry)
+			}
+		}
+	}
+	return entries, nil
+}
+
+func (store *ElasticStore) listDirectoryEntries(
+	ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int,
+) (entries []*filer.Entry, err error) {
+	first := true
+	index := getIndex(fullpath)
+	nextStart := ""
+	parentId := weed_util.Md5String([]byte(fullpath))
+	if _, err := store.client.Refresh(index).Do(ctx); err != nil {
+		if elastic.IsNotFound(err) {
+			store.client.CreateIndex(index).Do(ctx)
+			return entries, nil
+		}
+	}
+	for {
+		result := &elastic.SearchResult{}
+		if (startFileName == "" && first) || inclusive {
+			if result, err = store.search(ctx, index, parentId); err != nil {
+				glog.Errorf("search (%s,%s,%t,%d) %v.", string(fullpath), startFileName, inclusive, limit, err)
+				return entries, err
+			}
+		} else {
+			fullPath := string(fullpath) + "/" + startFileName
+			if !first {
+				fullPath = nextStart
+			}
+			after := weed_util.Md5String([]byte(fullPath))
+			if result, err = store.searchAfter(ctx, index, parentId, after); err != nil {
+				glog.Errorf("searchAfter (%s,%s,%t,%d) %v.", string(fullpath), startFileName, inclusive, limit, err)
+				return entries, err
+			}
+		}
+		first = false
+		for _, hit := range result.Hits.Hits {
+			esEntry := &ESEntry{
+				ParentId: "",
+				Entry:    &filer.Entry{},
+			}
+			if err := jsoniter.Unmarshal(hit.Source, esEntry); err == nil {
+				limit--
+				if limit < 0 {
+					return entries, nil
+				}
+				nextStart = string(esEntry.Entry.FullPath)
+				fileName := getFileName(esEntry.Entry.FullPath)
+				if fileName == startFileName && !inclusive {
+					continue
+				}
+				entries = append(entries, esEntry.Entry)
+			}
+		}
+		if len(result.Hits.Hits) < store.maxPageSize {
+			break
+		}
+	}
+	return entries, nil
+}
+
+func (store *ElasticStore) search(ctx context.Context, index, parentId string) (result *elastic.SearchResult, err error) {
+	if count, err := store.client.Count(index).Do(ctx); err == nil && count == 0 {
+		return &elastic.SearchResult{
+			Hits: &elastic.SearchHits{
+				Hits: make([]*elastic.SearchHit, 0)},
+		}, nil
+	}
+	queryResult, err := store.client.Search().
+		Index(index).
+		Query(elastic.NewMatchQuery("ParentId", parentId)).
+		Size(store.maxPageSize).
+		Sort("_id", false).
+		Do(ctx)
+	return queryResult, err
+}
+
+func (store *ElasticStore) searchAfter(ctx context.Context, index, parentId, after string) (result *elastic.SearchResult, err error) {
+	queryResult, err := store.client.Search().
+		Index(index).
+		Query(elastic.NewMatchQuery("ParentId", parentId)).
+		SearchAfter(after).
+		Size(store.maxPageSize).
+		Sort("_id", false).
+		Do(ctx)
+	return queryResult, err
+
+}
+
+func (store *ElasticStore) Shutdown() {
+	store.client.Stop()
+}
+
+func getIndex(fullpath weed_util.FullPath) string {
+	path := strings.Split(string(fullpath), "/")
+	if len(path) > 1 {
+		return indexPrefix + path[1]
+	}
+	return ""
+}
+
+func getFileName(fullpath weed_util.FullPath) string {
+	path := strings.Split(string(fullpath), "/")
+	if len(path) > 1 {
+		return path[len(path)-1]
+	}
+	return ""
+}
--- a/weed/filer/elastic/v7/elastic_store_kv.go
+++ b/weed/filer/elastic/v7/elastic_store_kv.go
@@ -0,0 +1,65 @@
+package elastic
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	jsoniter "github.com/json-iterator/go"
+	elastic "github.com/olivere/elastic/v7"
+)
+
+func (store *ElasticStore) KvDelete(ctx context.Context, key []byte) (err error) {
+	deleteResult, err := store.client.Delete().
+		Index(indexKV).
+		Type(indexType).
+		Id(string(key)).
+		Do(ctx)
+	if err == nil {
+		if deleteResult.Result == "deleted" || deleteResult.Result == "not_found" {
+			return nil
+		}
+	}
+	glog.Errorf("delete key(id:%s) %v.", string(key), err)
+	return fmt.Errorf("delete key %v.", err)
+}
+
+func (store *ElasticStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
+	searchResult, err := store.client.Get().
+		Index(indexKV).
+		Type(indexType).
+		Id(string(key)).
+		Do(ctx)
+	if elastic.IsNotFound(err) {
+		return value, filer.ErrKvNotFound
+	}
+	if searchResult != nil && searchResult.Found {
+		esEntry := &ESKVEntry{}
+		if err := jsoniter.Unmarshal(searchResult.Source, esEntry); err == nil {
+			return esEntry.Value, nil
+		}
+	}
+	glog.Errorf("find key(%s),%v.", string(key), err)
+	return value, filer.ErrKvNotFound
+}
+
+func (store *ElasticStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
+	esEntry := &ESKVEntry{value}
+	val, err := jsoniter.Marshal(esEntry)
+	if err != nil {
+		glog.Errorf("insert key(%s) %v.", string(key), err)
+		return fmt.Errorf("insert key %v.", err)
+	}
+	_, err = store.client.Index().
+		Index(indexKV).
+		Type(indexType).
+		Id(string(key)).
+		BodyJson(string(val)).
+		Do(ctx)
+	if err != nil {
+		return fmt.Errorf("kv put: %v", err)
+	}
+	return nil
+}
--- a/weed/filer/etcd/etcd_store.go
+++ b/weed/filer/etcd/etcd_store.go
@@ -76,12 +76,16 @@ func (store *EtcdStore) RollbackTransaction(ctx context.Context) error {
 func (store *EtcdStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
 	key := genKey(entry.DirAndName())

-	value, err := entry.EncodeAttributesAndChunks()
+	meta, err := entry.EncodeAttributesAndChunks()
 	if err != nil {
 		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
 	}

-	if _, err := store.client.Put(ctx, string(key), string(value)); err != nil {
+	if len(entry.Chunks) > 50 {
+		meta = weed_util.MaybeGzipData(meta)
+	}
+
+	if _, err := store.client.Put(ctx, string(key), string(meta)); err != nil {
 		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
 	}

@@ -107,7 +111,7 @@ func (store *EtcdStore) FindEntry(ctx context.Context, fullpath weed_util.FullPa
 	entry = &filer.Entry{
 		FullPath: fullpath,
 	}
-	err = entry.DecodeAttributesAndChunks(resp.Kvs[0].Value)
+	err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(resp.Kvs[0].Value))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
@@ -163,7 +167,7 @@ func (store *EtcdStore) ListDirectoryEntries(ctx context.Context, fullpath weed_
 		entry := &filer.Entry{
 			FullPath: weed_util.NewFullPath(string(fullpath), fileName),
 		}
-		if decodeErr := entry.DecodeAttributesAndChunks(kv.Value); decodeErr != nil {
+		if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(kv.Value)); decodeErr != nil {
 			err = decodeErr
 			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
 			break
--- a/weed/filer/etcd/etcd_store_kv.go
+++ b/weed/filer/etcd/etcd_store_kv.go
@@ -19,7 +19,7 @@ func (store *EtcdStore) KvPut(ctx context.Context, key []byte, value []byte) (er

 func (store *EtcdStore) KvGet(ctx context.Context, key []byte) (value []byte, err error) {

-	resp, err := store.client.Get(ctx, string(key), nil)
+	resp, err := store.client.Get(ctx, string(key))

 	if err != nil {
 		return nil, fmt.Errorf("kv get: %v", err)
--- a/weed/filer/filechunks.go
+++ b/weed/filer/filechunks.go
@@ -226,6 +226,11 @@ func NonOverlappingVisibleIntervals(lookupFileIdFn LookupFileIdFunctionType, chu

 	sort.Slice(chunks, func(i, j int) bool {
 		if chunks[i].Mtime == chunks[j].Mtime {
+			filer_pb.EnsureFid(chunks[i])
+			filer_pb.EnsureFid(chunks[j])
+			if chunks[i].Fid == nil || chunks[j].Fid == nil {
+				return true
+			}
 			return chunks[i].Fid.FileKey < chunks[j].Fid.FileKey
 		}
 		return chunks[i].Mtime < chunks[j].Mtime // keep this to make tests run
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -19,6 +19,7 @@ import (
 const (
 	LogFlushInterval = time.Minute
 	PaginationSize   = 1024 * 256
+	FilerStoreId     = "filer.store.id"
 )

 var (
@@ -48,7 +49,6 @@ func NewFiler(masters []string, grpcDialOption grpc.DialOption,
 		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, filerGrpcPort, masters),
 		fileIdDeletionQueue: util.NewUnboundedQueue(),
 		GrpcDialOption:      grpcDialOption,
-		Signature:           util.RandomInt32(),
 	}
 	f.LocalMetaLogBuffer = log_buffer.NewLogBuffer(LogFlushInterval, f.logFlushFunc, notifyFn)
 	f.metaLogCollection = collection
@@ -62,9 +62,16 @@ func NewFiler(masters []string, grpcDialOption grpc.DialOption,
 func (f *Filer) AggregateFromPeers(self string, filers []string) {

 	// set peers
-	if len(filers) == 0 {
+	found := false
+	for _, peer := range filers {
+		if peer == self {
+			found = true
+		}
+	}
+	if !found {
 		filers = append(filers, self)
 	}
+
 	f.MetaAggregator = NewMetaAggregator(filers, f.GrpcDialOption)
 	f.MetaAggregator.StartLoopSubscribe(f, self)

@@ -72,6 +79,27 @@ func (f *Filer) AggregateFromPeers(self string, filers []string) {

 func (f *Filer) SetStore(store FilerStore) {
 	f.Store = NewFilerStoreWrapper(store)
+
+	f.setOrLoadFilerStoreSignature(store)
+
+}
+
+func (f *Filer) setOrLoadFilerStoreSignature(store FilerStore) {
+	storeIdBytes, err := store.KvGet(context.Background(), []byte(FilerStoreId))
+	if err == ErrKvNotFound || err == nil && len(storeIdBytes) == 0 {
+		f.Signature = util.RandomInt32()
+		storeIdBytes = make([]byte, 4)
+		util.Uint32toBytes(storeIdBytes, uint32(f.Signature))
+		if err = store.KvPut(context.Background(), []byte(FilerStoreId), storeIdBytes); err != nil {
+			glog.Fatalf("set %s=%d : %v", FilerStoreId, f.Signature, err)
+		}
+		glog.V(0).Infof("create %s to %d", FilerStoreId, f.Signature)
+	} else if err == nil && len(storeIdBytes) == 4 {
+		f.Signature = int32(util.BytesToUint32(storeIdBytes))
+		glog.V(0).Infof("existing %s = %d", FilerStoreId, f.Signature)
+	} else {
+		glog.Fatalf("read %v=%v : %v", FilerStoreId, string(storeIdBytes), err)
+	}
 }

 func (f *Filer) GetStore() (store FilerStore) {
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@@ -27,7 +27,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	if entry.IsDirectory() {
 		// delete the folder children, not including the folder itself
 		var dirChunks []*filer_pb.FileChunk
-		dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster)
+		dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster, signatures)
 		if err != nil {
 			glog.V(0).Infof("delete directory %s: %v", p, err)
 			return fmt.Errorf("delete directory %s: %v", p, err)
@@ -53,7 +53,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	return nil
 }

-func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool) (chunks []*filer_pb.FileChunk, err error) {
+func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (chunks []*filer_pb.FileChunk, err error) {

 	lastFileName := ""
 	includeLastFile := false
@@ -73,7 +73,7 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 			lastFileName = sub.Name()
 			var dirChunks []*filer_pb.FileChunk
 			if sub.IsDirectory() {
-				dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, false)
+				dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, false, nil)
 				chunks = append(chunks, dirChunks...)
 			} else {
 				f.NotifyUpdateEvent(ctx, sub, nil, shouldDeleteChunks, isFromOtherCluster, nil)
@@ -95,7 +95,7 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 		return nil, fmt.Errorf("filer store delete: %v", storeDeletionErr)
 	}

-	f.NotifyUpdateEvent(ctx, entry, nil, shouldDeleteChunks, isFromOtherCluster, nil)
+	f.NotifyUpdateEvent(ctx, entry, nil, shouldDeleteChunks, isFromOtherCluster, signatures)

 	return chunks, nil
 }
--- a/weed/filer/filer_notify.go
+++ b/weed/filer/filer_notify.go
@@ -30,6 +30,15 @@ func (f *Filer) NotifyUpdateEvent(ctx context.Context, oldEntry, newEntry *Entry
 	if strings.HasPrefix(fullpath, SystemLogDir) {
 		return
 	}
+	foundSelf := false
+	for _, sig := range signatures {
+		if sig == f.Signature {
+			foundSelf = true
+		}
+	}
+	if !foundSelf {
+		signatures = append(signatures, f.Signature)
+	}

 	newParentPath := ""
 	if newEntry != nil {
@@ -41,7 +50,7 @@ func (f *Filer) NotifyUpdateEvent(ctx context.Context, oldEntry, newEntry *Entry
 		DeleteChunks:       deleteChunks,
 		NewParentPath:      newParentPath,
 		IsFromOtherCluster: isFromOtherCluster,
-		Signatures:         append(signatures, f.Signature),
+		Signatures:         signatures,
 	}

 	if notification.Queue != nil {
--- a/weed/filer/filerstore.go
+++ b/weed/filer/filerstore.go
@@ -42,11 +42,6 @@ type FilerStore interface {
 	Shutdown()
 }

-type FilerLocalStore interface {
-	UpdateOffset(filer string, lastTsNs int64) error
-	ReadOffset(filer string) (lastTsNs int64, err error)
-}
-
 type FilerStoreWrapper struct {
 	ActualStore FilerStore
 }
--- a/weed/filer/leveldb/leveldb_store.go
+++ b/weed/filer/leveldb/leveldb_store.go
@@ -78,6 +78,10 @@ func (store *LevelDBStore) InsertEntry(ctx context.Context, entry *filer.Entry)
 		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
 	}

+	if len(entry.Chunks) > 50 {
+		value = weed_util.MaybeGzipData(value)
+	}
+
 	err = store.db.Put(key, value, nil)

 	if err != nil {
@@ -109,7 +113,7 @@ func (store *LevelDBStore) FindEntry(ctx context.Context, fullpath weed_util.Ful
 	entry = &filer.Entry{
 		FullPath: fullpath,
 	}
-	err = entry.DecodeAttributesAndChunks(data)
+	err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData((data)))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
@@ -187,7 +191,7 @@ func (store *LevelDBStore) ListDirectoryEntries(ctx context.Context, fullpath we
 		entry := &filer.Entry{
 			FullPath: weed_util.NewFullPath(string(fullpath), fileName),
 		}
-		if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil {
+		if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(iter.Value())); decodeErr != nil {
 			err = decodeErr
 			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
 			break
--- a/weed/filer/leveldb2/leveldb2_local_store.go
+++ b/weed/filer/leveldb2/leveldb2_local_store.go
@@ -1,43 +0,0 @@
-package leveldb
-
-import (
-	"fmt"
-
-	"github.com/chrislusf/seaweedfs/weed/filer"
-	"github.com/chrislusf/seaweedfs/weed/util"
-)
-
-var (
-	_ = filer.FilerLocalStore(&LevelDB2Store{})
-)
-
-func (store *LevelDB2Store) UpdateOffset(filer string, lastTsNs int64) error {
-
-	value := make([]byte, 8)
-	util.Uint64toBytes(value, uint64(lastTsNs))
-
-	err := store.dbs[0].Put([]byte("meta"+filer), value, nil)
-
-	if err != nil {
-		return fmt.Errorf("UpdateOffset %s : %v", filer, err)
-	}
-
-	println("UpdateOffset", filer, "lastTsNs", lastTsNs)
-
-	return nil
-}
-
-func (store *LevelDB2Store) ReadOffset(filer string) (lastTsNs int64, err error) {
-
-	value, err := store.dbs[0].Get([]byte("meta"+filer), nil)
-
-	if err != nil {
-		return 0, fmt.Errorf("ReadOffset %s : %v", filer, err)
-	}
-
-	lastTsNs = int64(util.BytesToUint64(value))
-
-	println("ReadOffset", filer, "lastTsNs", lastTsNs)
-
-	return
-}
--- a/weed/filer/leveldb2/leveldb2_store.go
+++ b/weed/filer/leveldb2/leveldb2_store.go
@@ -85,6 +85,10 @@ func (store *LevelDB2Store) InsertEntry(ctx context.Context, entry *filer.Entry)
 		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
 	}

+	if len(entry.Chunks) > 50 {
+		value = weed_util.MaybeGzipData(value)
+	}
+
 	err = store.dbs[partitionId].Put(key, value, nil)

 	if err != nil {
@@ -117,7 +121,7 @@ func (store *LevelDB2Store) FindEntry(ctx context.Context, fullpath weed_util.Fu
 	entry = &filer.Entry{
 		FullPath: fullpath,
 	}
-	err = entry.DecodeAttributesAndChunks(data)
+	err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(data))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
@@ -199,8 +203,7 @@ func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath w
 		}

 		// println("list", entry.FullPath, "chunks", len(entry.Chunks))
-
-		if decodeErr := entry.DecodeAttributesAndChunks(iter.Value()); decodeErr != nil {
+		if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(iter.Value())); decodeErr != nil {
 			err = decodeErr
 			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
 			break
--- a/weed/filer/meta_aggregator.go
+++ b/weed/filer/meta_aggregator.go
@@ -3,6 +3,7 @@ package filer
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
 	"sync"
 	"time"
@@ -45,40 +46,57 @@ func (ma *MetaAggregator) StartLoopSubscribe(f *Filer, self string) {
 	}
 }

-func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, filer string) {
+func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, peer string) {
+
+	/*
+		Each filer reads the "filer.store.id", which is the store's signature when filer starts.
+
+		When reading from other filers' local meta changes:
+		* if the received change does not contain signature from self, apply the change to current filer store.
+
+		Upon connecting to other filers, need to remember their signature and their offsets.
+
+	*/

 	var maybeReplicateMetadataChange func(*filer_pb.SubscribeMetadataResponse)
 	lastPersistTime := time.Now()
-	changesSinceLastPersist := 0
 	lastTsNs := time.Now().Add(-LogFlushInterval).UnixNano()

-	MaxChangeLimit := 100
+	peerSignature, err := ma.readFilerStoreSignature(peer)
+	for err != nil {
+		glog.V(0).Infof("connecting to peer filer %s: %v", peer, err)
+		time.Sleep(1357 * time.Millisecond)
+		peerSignature, err = ma.readFilerStoreSignature(peer)
+	}

-	if localStore, ok := f.Store.ActualStore.(FilerLocalStore); ok {
-		if self != filer {
+	if peerSignature != f.Signature {
+		if prevTsNs, err := ma.readOffset(f, peer, peerSignature); err == nil {
+			lastTsNs = prevTsNs
+		}

-			if prevTsNs, err := localStore.ReadOffset(filer); err == nil {
-				lastTsNs = prevTsNs
+		glog.V(0).Infof("follow peer: %v, last %v (%d)", peer, time.Unix(0, lastTsNs), lastTsNs)
+		var counter int64
+		var synced bool
+		maybeReplicateMetadataChange = func(event *filer_pb.SubscribeMetadataResponse) {
+			if err := Replay(f.Store.ActualStore, event); err != nil {
+				glog.Errorf("failed to reply metadata change from %v: %v", peer, err)
+				return
 			}
-
-			glog.V(0).Infof("follow filer: %v, last %v (%d)", filer, time.Unix(0, lastTsNs), lastTsNs)
-			maybeReplicateMetadataChange = func(event *filer_pb.SubscribeMetadataResponse) {
-				if err := Replay(f.Store.ActualStore, event); err != nil {
-					glog.Errorf("failed to reply metadata change from %v: %v", filer, err)
-					return
-				}
-				changesSinceLastPersist++
-				if changesSinceLastPersist >= MaxChangeLimit || lastPersistTime.Add(time.Minute).Before(time.Now()) {
-					if err := localStore.UpdateOffset(filer, event.TsNs); err == nil {
-						lastPersistTime = time.Now()
-						changesSinceLastPersist = 0
-					} else {
-						glog.V(0).Infof("failed to update offset for %v: %v", filer, err)
+			counter++
+			if lastPersistTime.Add(time.Minute).Before(time.Now()) {
+				if err := ma.updateOffset(f, peer, peerSignature, event.TsNs); err == nil {
+					if event.TsNs < time.Now().Add(-2*time.Minute).UnixNano() {
+						glog.V(0).Infof("sync with %s progressed to: %v %0.2f/sec", peer, time.Unix(0, event.TsNs), float64(counter)/60.0)
+					} else if !synced {
+						synced = true
+						glog.V(0).Infof("synced with %s", peer)
 					}
+					lastPersistTime = time.Now()
+					counter = 0
+				} else {
+					glog.V(0).Infof("failed to update offset for %v: %v", peer, err)
 				}
 			}
-		} else {
-			glog.V(0).Infof("skipping following self: %v", self)
 		}
 	}

@@ -90,7 +108,7 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, filer strin
 		}
 		dir := event.Directory
 		// println("received meta change", dir, "size", len(data))
-		ma.MetaLogBuffer.AddToBuffer([]byte(dir), data, event.TsNs)
+		ma.MetaLogBuffer.AddToBuffer([]byte(dir), data, 0)
 		if maybeReplicateMetadataChange != nil {
 			maybeReplicateMetadataChange(event)
 		}
@@ -98,8 +116,10 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, filer strin
 	}

 	for {
-		err := pb.WithFilerClient(filer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-			stream, err := client.SubscribeLocalMetadata(context.Background(), &filer_pb.SubscribeMetadataRequest{
+		err := pb.WithFilerClient(peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			stream, err := client.SubscribeLocalMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
 				ClientName: "filer:" + self,
 				PathPrefix: "/",
 				SinceNs:    lastTsNs,
@@ -124,8 +144,66 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, filer strin
 			}
 		})
 		if err != nil {
-			glog.V(0).Infof("subscribing remote %s meta change: %v", filer, err)
+			glog.V(0).Infof("subscribing remote %s meta change: %v", peer, err)
 			time.Sleep(1733 * time.Millisecond)
 		}
 	}
 }
+
+func (ma *MetaAggregator) readFilerStoreSignature(peer string) (sig int32, err error) {
+	err = pb.WithFilerClient(peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+		if err != nil {
+			return err
+		}
+		sig = resp.Signature
+		return nil
+	})
+	return
+}
+
+const (
+	MetaOffsetPrefix = "Meta"
+)
+
+func (ma *MetaAggregator) readOffset(f *Filer, peer string, peerSignature int32) (lastTsNs int64, err error) {
+
+	key := []byte(MetaOffsetPrefix + "xxxx")
+	util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature))
+
+	value, err := f.Store.KvGet(context.Background(), key)
+
+	if err == ErrKvNotFound {
+		glog.Warningf("readOffset %s not found", peer)
+		return 0, nil
+	}
+
+	if err != nil {
+		return 0, fmt.Errorf("readOffset %s : %v", peer, err)
+	}
+
+	lastTsNs = int64(util.BytesToUint64(value))
+
+	glog.V(0).Infof("readOffset %s : %d", peer, lastTsNs)
+
+	return
+}
+
+func (ma *MetaAggregator) updateOffset(f *Filer, peer string, peerSignature int32, lastTsNs int64) (err error) {
+
+	key := []byte(MetaOffsetPrefix + "xxxx")
+	util.Uint32toBytes(key[len(MetaOffsetPrefix):], uint32(peerSignature))
+
+	value := make([]byte, 8)
+	util.Uint64toBytes(value, uint64(lastTsNs))
+
+	err = f.Store.KvPut(context.Background(), key, value)
+
+	if err != nil {
+		return fmt.Errorf("updateOffset %s : %v", peer, err)
+	}
+
+	glog.V(4).Infof("updateOffset %s : %d", peer, lastTsNs)
+
+	return
+}
--- a/weed/filer/mongodb/mongodb_store.go
+++ b/weed/filer/mongodb/mongodb_store.go
@@ -101,6 +101,10 @@ func (store *MongodbStore) InsertEntry(ctx context.Context, entry *filer.Entry)
 		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
 	}

+	if len(entry.Chunks) > 50 {
+		meta = util.MaybeGzipData(meta)
+	}
+
 	c := store.connect.Database(store.database).Collection(store.collectionName)

 	_, err = c.InsertOne(ctx, Model{
@@ -128,7 +132,7 @@ func (store *MongodbStore) FindEntry(ctx context.Context, fullpath util.FullPath
 	var where = bson.M{"directory": dir, "name": name}
 	err = store.connect.Database(store.database).Collection(store.collectionName).FindOne(ctx, where).Decode(&data)
 	if err != mongo.ErrNoDocuments && err != nil {
-		glog.Error("find %s: %v", fullpath, err)
+		glog.Errorf("find %s: %v", fullpath, err)
 		return nil, filer_pb.ErrNotFound
 	}

@@ -140,7 +144,7 @@ func (store *MongodbStore) FindEntry(ctx context.Context, fullpath util.FullPath
 		FullPath: fullpath,
 	}

-	err = entry.DecodeAttributesAndChunks(data.Meta)
+	err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data.Meta))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
@@ -197,7 +201,7 @@ func (store *MongodbStore) ListDirectoryEntries(ctx context.Context, fullpath ut
 		entry := &filer.Entry{
 			FullPath: util.NewFullPath(string(fullpath), data.Name),
 		}
-		if decodeErr := entry.DecodeAttributesAndChunks(data.Meta); decodeErr != nil {
+		if decodeErr := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data.Meta)); decodeErr != nil {
 			err = decodeErr
 			glog.V(0).Infof("list %s : %v", entry.FullPath, err)
 			break
--- a/weed/filer/mongodb/mongodb_store_kv.go
+++ b/weed/filer/mongodb/mongodb_store_kv.go
@@ -36,7 +36,7 @@ func (store *MongodbStore) KvGet(ctx context.Context, key []byte) (value []byte,
 	var where = bson.M{"directory": dir, "name": name}
 	err = store.connect.Database(store.database).Collection(store.collectionName).FindOne(ctx, where).Decode(&data)
 	if err != mongo.ErrNoDocuments && err != nil {
-		glog.Error("kv get: %v", err)
+		glog.Errorf("kv get: %v", err)
 		return nil, filer.ErrKvNotFound
 	}

@@ -54,7 +54,7 @@ func (store *MongodbStore) KvDelete(ctx context.Context, key []byte) (err error)
 	where := bson.M{"directory": dir, "name": name}
 	_, err = store.connect.Database(store.database).Collection(store.collectionName).DeleteOne(ctx, where)
 	if err != nil {
-		return fmt.Errorf("kv delete %s : %v", err)
+		return fmt.Errorf("kv delete: %v", err)
 	}

 	return nil
--- a/weed/filer/mysql/mysql_store.go
+++ b/weed/filer/mysql/mysql_store.go
@@ -47,8 +47,8 @@ func (store *MysqlStore) initialize(user, password, hostname string, port int, d
 	store.SqlFind = "SELECT meta FROM filemeta WHERE dirhash=? AND name=? AND directory=?"
 	store.SqlDelete = "DELETE FROM filemeta WHERE dirhash=? AND name=? AND directory=?"
 	store.SqlDeleteFolderChildren = "DELETE FROM filemeta WHERE dirhash=? AND directory=?"
-	store.SqlListExclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>? AND directory=? AND name like CONCAT(?,'%') ORDER BY NAME ASC LIMIT ?"
-	store.SqlListInclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>=? AND directory=? AND name like CONCAT(?,'%') ORDER BY NAME ASC LIMIT ?"
+	store.SqlListExclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>? AND directory=? AND name like ? ORDER BY NAME ASC LIMIT ?"
+	store.SqlListInclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>=? AND directory=? AND name like ? ORDER BY NAME ASC LIMIT ?"

 	sqlUrl := fmt.Sprintf(CONNECTION_URL_PATTERN, user, password, hostname, port, database)
 	if interpolateParams {
--- a/weed/filer/postgres/postgres_store.go
+++ b/weed/filer/postgres/postgres_store.go
@@ -46,8 +46,8 @@ func (store *PostgresStore) initialize(user, password, hostname string, port int
 	store.SqlFind = "SELECT meta FROM filemeta WHERE dirhash=$1 AND name=$2 AND directory=$3"
 	store.SqlDelete = "DELETE FROM filemeta WHERE dirhash=$1 AND name=$2 AND directory=$3"
 	store.SqlDeleteFolderChildren = "DELETE FROM filemeta WHERE dirhash=$1 AND directory=$2"
-	store.SqlListExclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>$2 AND directory=$3 AND name like CONCAT($4,'%')ORDER BY NAME ASC LIMIT $5"
-	store.SqlListInclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>=$2 AND directory=$3 AND name like CONCAT($4,'%') ORDER BY NAME ASC LIMIT $5"
+	store.SqlListExclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>$2 AND directory=$3 AND name like $4 ORDER BY NAME ASC LIMIT $5"
+	store.SqlListInclusive = "SELECT NAME, meta FROM filemeta WHERE dirhash=$1 AND name>=$2 AND directory=$3 AND name like $4 ORDER BY NAME ASC LIMIT $5"

 	sqlUrl := fmt.Sprintf(CONNECTION_URL_PATTERN, hostname, port, user, sslmode)
 	if password != "" {
--- a/weed/filer/redis/universal_redis_store.go
+++ b/weed/filer/redis/universal_redis_store.go
@@ -40,6 +40,10 @@ func (store *UniversalRedisStore) InsertEntry(ctx context.Context, entry *filer.
 		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
 	}

+	if len(entry.Chunks) > 50 {
+		value = util.MaybeGzipData(value)
+	}
+
 	_, err = store.Client.Set(string(entry.FullPath), value, time.Duration(entry.TtlSec)*time.Second).Result()

 	if err != nil {
@@ -76,7 +80,7 @@ func (store *UniversalRedisStore) FindEntry(ctx context.Context, fullpath util.F
 	entry = &filer.Entry{
 		FullPath: fullpath,
 	}
-	err = entry.DecodeAttributesAndChunks([]byte(data))
+	err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData([]byte(data)))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
--- a/weed/filer/redis2/universal_redis_store.go
+++ b/weed/filer/redis2/universal_redis_store.go
@@ -38,6 +38,10 @@ func (store *UniversalRedis2Store) InsertEntry(ctx context.Context, entry *filer
 		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
 	}

+	if len(entry.Chunks) > 50 {
+		value = util.MaybeGzipData(value)
+	}
+
 	if err = store.Client.Set(string(entry.FullPath), value, time.Duration(entry.TtlSec)*time.Second).Err(); err != nil {
 		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
 	}
@@ -71,7 +75,7 @@ func (store *UniversalRedis2Store) FindEntry(ctx context.Context, fullpath util.
 	entry = &filer.Entry{
 		FullPath: fullpath,
 	}
-	err = entry.DecodeAttributesAndChunks([]byte(data))
+	err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData([]byte(data)))
 	if err != nil {
 		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
@@ -81,8 +85,12 @@ func (store *UniversalRedis2Store) FindEntry(ctx context.Context, fullpath util.

 func (store *UniversalRedis2Store) DeleteEntry(ctx context.Context, fullpath util.FullPath) (err error) {

-	_, err = store.Client.Del(string(fullpath)).Result()
+	_, err = store.Client.Del(genDirectoryListKey(string(fullpath))).Result()
+	if err != nil {
+		return fmt.Errorf("delete dir list %s : %v", fullpath, err)
+	}

+	_, err = store.Client.Del(string(fullpath)).Result()
 	if err != nil {
 		return fmt.Errorf("delete %s : %v", fullpath, err)
 	}
@@ -91,7 +99,7 @@ func (store *UniversalRedis2Store) DeleteEntry(ctx context.Context, fullpath uti
 	if name != "" {
 		_, err = store.Client.ZRem(genDirectoryListKey(dir), name).Result()
 		if err != nil {
-			return fmt.Errorf("delete %s in parent dir: %v", fullpath, err)
+			return fmt.Errorf("DeleteEntry %s in parent dir: %v", fullpath, err)
 		}
 	}

@@ -102,14 +110,14 @@ func (store *UniversalRedis2Store) DeleteFolderChildren(ctx context.Context, ful

 	members, err := store.Client.ZRange(genDirectoryListKey(string(fullpath)), 0, -1).Result()
 	if err != nil {
-		return fmt.Errorf("delete folder %s : %v", fullpath, err)
+		return fmt.Errorf("DeleteFolderChildren %s : %v", fullpath, err)
 	}

 	for _, fileName := range members {
 		path := util.NewFullPath(string(fullpath), fileName)
 		_, err = store.Client.Del(string(path)).Result()
 		if err != nil {
-			return fmt.Errorf("delete %s in parent dir: %v", fullpath, err)
+			return fmt.Errorf("DeleteFolderChildren %s in parent dir: %v", fullpath, err)
 		}
 	}

--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@@ -148,6 +148,10 @@ func (dir *Dir) Create(ctx context.Context, req *fuse.CreateRequest,
 	glog.V(1).Infof("create %s/%s: %v", dir.FullPath(), req.Name, req.Flags)

 	if err := dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		dir.wfs.mapPbIdFromLocalToFiler(request.Entry)
+		defer dir.wfs.mapPbIdFromFilerToLocal(request.Entry)
+
 		if err := filer_pb.CreateEntry(client, request); err != nil {
 			if strings.Contains(err.Error(), "EEXIST") {
 				return fuse.EEXIST
@@ -193,6 +197,9 @@ func (dir *Dir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, err

 	err := dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

+		dir.wfs.mapPbIdFromLocalToFiler(newEntry)
+		defer dir.wfs.mapPbIdFromFilerToLocal(newEntry)
+
 		request := &filer_pb.CreateEntryRequest{
 			Directory:  dir.FullPath(),
 			Entry:      newEntry,
@@ -321,7 +328,7 @@ func (dir *Dir) removeOneFile(req *fuse.RemoveRequest) error {

 	// first, ensure the filer store can correctly delete
 	glog.V(3).Infof("remove file: %v", req)
-	err = filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, false, false, false, false, dir.wfs.signature)
+	err = filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, false, false, false, false, []int32{dir.wfs.signature})
 	if err != nil {
 		glog.V(3).Infof("not found remove file %s/%s: %v", dir.FullPath(), req.Name, err)
 		return fuse.ENOENT
@@ -341,7 +348,7 @@ func (dir *Dir) removeOneFile(req *fuse.RemoveRequest) error {
 func (dir *Dir) removeFolder(req *fuse.RemoveRequest) error {

 	glog.V(3).Infof("remove directory entry: %v", req)
-	err := filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, true, false, false, false, dir.wfs.signature)
+	err := filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, true, false, false, false, []int32{dir.wfs.signature})
 	if err != nil {
 		glog.V(0).Infof("remove %s/%s: %v", dir.FullPath(), req.Name, err)
 		if strings.Contains(err.Error(), "non-empty") {
@@ -458,6 +465,9 @@ func (dir *Dir) saveEntry() error {

 	return dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

+		dir.wfs.mapPbIdFromLocalToFiler(dir.entry)
+		defer dir.wfs.mapPbIdFromFilerToLocal(dir.entry)
+
 		request := &filer_pb.UpdateEntryRequest{
 			Directory:  parentDir,
 			Entry:      dir.entry,
--- a/weed/filesys/dir_link.go
+++ b/weed/filesys/dir_link.go
@@ -38,6 +38,10 @@ func (dir *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fs.Node,
 	}

 	err := dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		dir.wfs.mapPbIdFromLocalToFiler(request.Entry)
+		defer dir.wfs.mapPbIdFromFilerToLocal(request.Entry)
+
 		if err := filer_pb.CreateEntry(client, request); err != nil {
 			glog.V(0).Infof("symlink %s/%s: %v", dir.FullPath(), req.NewName, err)
 			return fuse.EIO
--- a/weed/filesys/dir_rename.go
+++ b/weed/filesys/dir_rename.go
@@ -29,6 +29,8 @@ func (dir *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDirector

 	// update remote filer
 	err = dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()

 		request := &filer_pb.AtomicRenameEntryRequest{
 			OldDirectory: dir.FullPath(),
@@ -37,7 +39,7 @@ func (dir *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDirector
 			NewName:      req.NewName,
 		}

-		_, err := client.AtomicRenameEntry(context.Background(), request)
+		_, err := client.AtomicRenameEntry(ctx, request)
 		if err != nil {
 			return fuse.EIO
 		}
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@@ -292,6 +292,9 @@ func (file *File) setEntry(entry *filer_pb.Entry) {
 func (file *File) saveEntry() error {
 	return file.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

+		file.wfs.mapPbIdFromLocalToFiler(file.entry)
+		defer file.wfs.mapPbIdFromFilerToLocal(file.entry)
+
 		request := &filer_pb.UpdateEntryRequest{
 			Directory:  file.dir.FullPath(),
 			Entry:      file.entry,
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -265,6 +265,9 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 		fh.f.entry.Chunks = append(chunks, manifestChunks...)
 		fh.f.entryViewCache = nil

+		fh.f.wfs.mapPbIdFromLocalToFiler(request.Entry)
+		defer fh.f.wfs.mapPbIdFromFilerToLocal(request.Entry)
+
 		if err := filer_pb.CreateEntry(client, request); err != nil {
 			glog.Errorf("fh flush create %s: %v", fh.f.fullpath(), err)
 			return fmt.Errorf("fh flush create %s: %v", fh.f.fullpath(), err)
--- a/weed/filesys/meta_cache/id_mapper.go
+++ b/weed/filesys/meta_cache/id_mapper.go
@@ -0,0 +1,101 @@
+package meta_cache
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type UidGidMapper struct {
+	uidMapper *IdMapper
+	gidMapper *IdMapper
+}
+
+type IdMapper struct {
+	localToFiler map[uint32]uint32
+	filerToLocal map[uint32]uint32
+}
+
+// UidGidMapper translates local uid/gid to filer uid/gid
+// The local storage always persists the same as the filer.
+// The local->filer translation happens when updating the filer first and later saving to meta_cache.
+// And filer->local happens when reading from the meta_cache.
+func NewUidGidMapper(uidPairsStr, gidPairStr string) (*UidGidMapper, error) {
+	uidMapper, err := newIdMapper(uidPairsStr)
+	if err != nil {
+		return nil, err
+	}
+	gidMapper, err := newIdMapper(gidPairStr)
+	if err != nil {
+		return nil, err
+	}
+
+	return &UidGidMapper{
+		uidMapper: uidMapper,
+		gidMapper: gidMapper,
+	}, nil
+}
+
+func (m *UidGidMapper) LocalToFiler(uid, gid uint32) (uint32, uint32) {
+	return m.uidMapper.LocalToFiler(uid), m.gidMapper.LocalToFiler(gid)
+}
+func (m *UidGidMapper) FilerToLocal(uid, gid uint32) (uint32, uint32) {
+	return m.uidMapper.FilerToLocal(uid), m.gidMapper.FilerToLocal(gid)
+}
+
+func (m *IdMapper) LocalToFiler(id uint32) uint32 {
+	value, found := m.localToFiler[id]
+	if found {
+		return value
+	}
+	return id
+}
+func (m *IdMapper) FilerToLocal(id uint32) uint32 {
+	value, found := m.filerToLocal[id]
+	if found {
+		return value
+	}
+	return id
+}
+
+func newIdMapper(pairsStr string) (*IdMapper, error) {
+
+	localToFiler, filerToLocal, err := parseUint32Pairs(pairsStr)
+	if err != nil {
+		return nil, err
+	}
+
+	return &IdMapper{
+		localToFiler: localToFiler,
+		filerToLocal: filerToLocal,
+	}, nil
+
+}
+
+func parseUint32Pairs(pairsStr string) (localToFiler, filerToLocal map[uint32]uint32, err error) {
+
+	if pairsStr == "" {
+		return
+	}
+
+	localToFiler = make(map[uint32]uint32)
+	filerToLocal = make(map[uint32]uint32)
+	for _, pairStr := range strings.Split(pairsStr, ",") {
+		pair := strings.Split(pairStr, ":")
+		localUidStr, filerUidStr := pair[0], pair[1]
+		localUid, localUidErr := strconv.Atoi(localUidStr)
+		if localUidErr != nil {
+			err = fmt.Errorf("failed to parse local %s: %v", localUidStr, localUidErr)
+			return
+		}
+		filerUid, filerUidErr := strconv.Atoi(filerUidStr)
+		if filerUidErr != nil {
+			err = fmt.Errorf("failed to parse remote %s: %v", filerUidStr, filerUidErr)
+			return
+		}
+		localToFiler[uint32(localUid)] = uint32(filerUid)
+		filerToLocal[uint32(filerUid)] = uint32(localUid)
+	}
+
+	return
+}
--- a/weed/filesys/meta_cache/meta_cache.go
+++ b/weed/filesys/meta_cache/meta_cache.go
@@ -20,12 +20,14 @@ type MetaCache struct {
 	actualStore filer.FilerStore
 	sync.RWMutex
 	visitedBoundary *bounded_tree.BoundedTree
+	uidGidMapper    *UidGidMapper
 }

-func NewMetaCache(dbFolder string) *MetaCache {
+func NewMetaCache(dbFolder string, uidGidMapper *UidGidMapper) *MetaCache {
 	return &MetaCache{
 		actualStore:     openMetaStore(dbFolder),
 		visitedBoundary: bounded_tree.NewBoundedTree(),
+		uidGidMapper:    uidGidMapper,
 	}
 }

@@ -58,7 +60,7 @@ func (mc *MetaCache) doInsertEntry(ctx context.Context, entry *filer.Entry) erro
 	return mc.actualStore.InsertEntry(ctx, entry)
 }

-func (mc *MetaCache) AtomicUpdateEntry(ctx context.Context, oldPath util.FullPath, newEntry *filer.Entry) error {
+func (mc *MetaCache) AtomicUpdateEntryFromFiler(ctx context.Context, oldPath util.FullPath, newEntry *filer.Entry) error {
 	mc.Lock()
 	defer mc.Unlock()

@@ -103,6 +105,7 @@ func (mc *MetaCache) FindEntry(ctx context.Context, fp util.FullPath) (entry *fi
 	if err != nil {
 		return nil, err
 	}
+	mc.mapIdFromFilerToLocal(entry)
 	filer_pb.AfterEntryDeserialization(entry.Chunks)
 	return
 }
@@ -122,6 +125,7 @@ func (mc *MetaCache) ListDirectoryEntries(ctx context.Context, dirPath util.Full
 		return nil, err
 	}
 	for _, entry := range entries {
+		mc.mapIdFromFilerToLocal(entry)
 		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, err
@@ -132,3 +136,7 @@ func (mc *MetaCache) Shutdown() {
 	defer mc.Unlock()
 	mc.actualStore.Shutdown()
 }
+
+func (mc *MetaCache) mapIdFromFilerToLocal(entry *filer.Entry) {
+	entry.Attr.Uid, entry.Attr.Gid = mc.uidGidMapper.FilerToLocal(entry.Attr.Uid, entry.Attr.Gid)
+}
--- a/weed/filesys/meta_cache/meta_cache_subscribe.go
+++ b/weed/filesys/meta_cache/meta_cache_subscribe.go
@@ -39,12 +39,14 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 			glog.V(4).Infof("creating %v", key)
 			newEntry = filer.FromPbEntry(dir, message.NewEntry)
 		}
-		return mc.AtomicUpdateEntry(context.Background(), oldPath, newEntry)
+		return mc.AtomicUpdateEntryFromFiler(context.Background(), oldPath, newEntry)
 	}

 	for {
 		err := client.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-			stream, err := client.SubscribeMetadata(context.Background(), &filer_pb.SubscribeMetadataRequest{
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
 				ClientName: "mount",
 				PathPrefix: dir,
 				SinceNs:    lastTsNs,
@@ -71,7 +73,7 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 		})
 		if err != nil {
 			glog.Errorf("subscribing filer meta change: %v", err)
-			time.Sleep(time.Second)
 		}
+		time.Sleep(time.Second)
 	}
 }
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -45,7 +45,7 @@ type Option struct {

 	OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
 	Cipher                      bool // whether encrypt data on volume server
-
+	UidGidMapper                *meta_cache.UidGidMapper
 }

 var _ = fs.FS(&WFS{})
@@ -92,7 +92,7 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, cacheDir, option.CacheSizeMB)
 	}

-	wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"))
+	wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"), option.UidGidMapper)
 	startTime := time.Now()
 	go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
 	grace.OnInterrupt(func() {
@@ -206,3 +206,10 @@ func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.

 	return nil
 }
+
+func (wfs *WFS) mapPbIdFromFilerToLocal(entry *filer_pb.Entry) {
+	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.FilerToLocal(entry.Attributes.Uid, entry.Attributes.Gid)
+}
+func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) {
+	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.LocalToFiler(entry.Attributes.Uid, entry.Attributes.Gid)
+}
--- a/weed/messaging/broker/broker_grpc_server.go
+++ b/weed/messaging/broker/broker_grpc_server.go
@@ -19,7 +19,7 @@ func (broker *MessageBroker) DeleteTopic(c context.Context, request *messaging_p
 	if exists, err := filer_pb.Exists(broker, dir, entry, true); err != nil {
 		return nil, err
 	} else if exists {
-		err = filer_pb.Remove(broker, dir, entry, true, true, true, false, 0)
+		err = filer_pb.Remove(broker, dir, entry, true, true, true, false, nil)
 	}
 	return resp, nil
 }
--- a/weed/messaging/broker/broker_grpc_server_subscribe.go
+++ b/weed/messaging/broker/broker_grpc_server_subscribe.go
@@ -2,6 +2,7 @@ package broker

 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util/log_buffer"
 	"io"
 	"strings"
 	"time"
@@ -113,12 +114,21 @@ func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_Subs

 	// fmt.Printf("subscriber %s read %d on disk log %v\n", subscriberId, messageCount, lastReadTime)

-	err = lock.logBuffer.LoopProcessLogData(lastReadTime, func() bool {
-		lock.Mutex.Lock()
-		lock.cond.Wait()
-		lock.Mutex.Unlock()
-		return isConnected
-	}, eachLogEntryFn)
+	for {
+		lastReadTime, err = lock.logBuffer.LoopProcessLogData(lastReadTime, func() bool {
+			lock.Mutex.Lock()
+			lock.cond.Wait()
+			lock.Mutex.Unlock()
+			return isConnected
+		}, eachLogEntryFn)
+		if err != nil {
+			glog.Errorf("processed to %v: %v", lastReadTime, err)
+			time.Sleep(3127 * time.Millisecond)
+			if err != log_buffer.ResumeError {
+				break
+			}
+		}
+	}

 	return err

--- a/weed/messaging/broker/broker_server.go
+++ b/weed/messaging/broker/broker_server.go
@@ -48,7 +48,9 @@ func (broker *MessageBroker) keepConnectedToOneFiler() {
 	for {
 		for _, filer := range broker.option.Filers {
 			broker.withFilerClient(filer, func(client filer_pb.SeaweedFilerClient) error {
-				stream, err := client.KeepConnected(context.Background())
+				ctx, cancel := context.WithCancel(context.Background())
+				defer cancel()
+				stream, err := client.KeepConnected(ctx)
 				if err != nil {
 					glog.V(0).Infof("%s:%d failed to keep connected to %s: %v", broker.option.Ip, broker.option.Port, filer, err)
 					return err
--- a/weed/operation/tail_volume.go
+++ b/weed/operation/tail_volume.go
@@ -28,8 +28,10 @@ func TailVolume(master string, grpcDialOption grpc.DialOption, vid needle.Volume

 func TailVolumeFromSource(volumeServer string, grpcDialOption grpc.DialOption, vid needle.VolumeId, sinceNs uint64, idleTimeoutSeconds int, fn func(n *needle.Needle) error) error {
 	return WithVolumeServerClient(volumeServer, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()

-		stream, err := client.VolumeTailSender(context.Background(), &volume_server_pb.VolumeTailSenderRequest{
+		stream, err := client.VolumeTailSender(ctx, &volume_server_pb.VolumeTailSenderRequest{
 			VolumeId:           uint32(vid),
 			SinceNs:            sinceNs,
 			IdleTimeoutSeconds: uint32(idleTimeoutSeconds),
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"net/textproto"
 	"path/filepath"
+	"runtime/debug"
 	"strings"
 	"time"

@@ -85,7 +86,7 @@ func doUpload(uploadUrl string, filename string, cipher bool, reader io.Reader,
 }

 func retriedUploadData(uploadUrl string, filename string, cipher bool, data []byte, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error) {
-	for i := 0; i < 3; i++ {
+	for i := 0; i < 1; i++ {
 		uploadResult, err = doUploadData(uploadUrl, filename, cipher, data, isInputCompressed, mtype, pairMap, jwt)
 		if err == nil {
 			return
@@ -221,8 +222,9 @@ func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error
 	}
 	resp, post_err := HttpClient.Do(req)
 	if post_err != nil {
-		glog.Errorf("upload to %v: %v", uploadUrl, post_err)
-		return nil, fmt.Errorf("upload to %v: %v", uploadUrl, post_err)
+		glog.Errorf("upload %s %d bytes to %v: %v", filename, originalDataSize, uploadUrl, post_err)
+		debug.PrintStack()
+		return nil, fmt.Errorf("upload %s %d bytes to %v: %v", filename, originalDataSize, uploadUrl, post_err)
 	}
 	defer util.CloseResponse(resp)

--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -58,6 +58,12 @@ service SeaweedFiler {
    rpc LocateBroker (LocateBrokerRequest) returns (LocateBrokerResponse) {
    }

+    rpc KvGet (KvGetRequest) returns (KvGetResponse) {
+    }
+
+    rpc KvPut (KvPutRequest) returns (KvPutResponse) {
+    }
+
 }

 //////////////////////////////////////////////////
@@ -266,6 +272,7 @@ message GetFilerConfigurationResponse {
    uint32 max_mb = 4;
    string dir_buckets = 5;
    bool cipher = 7;
+    int32 signature = 8;
 }

 message SubscribeMetadataRequest {
@@ -307,3 +314,19 @@ message LocateBrokerResponse {
    }
    repeated Resource resources = 2;
 }
+
+// Key-Value operations
+message KvGetRequest {
+    bytes key = 1;
+}
+message KvGetResponse {
+    bytes value = 1;
+    string error = 2;
+}
+message KvPutRequest {
+    bytes key = 1;
+    bytes value = 2;
+}
+message KvPutResponse {
+    string error = 1;
+}
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -2124,6 +2124,7 @@ type GetFilerConfigurationResponse struct {
 	MaxMb       uint32   `protobuf:"varint,4,opt,name=max_mb,json=maxMb,proto3" json:"max_mb,omitempty"`
 	DirBuckets  string   `protobuf:"bytes,5,opt,name=dir_buckets,json=dirBuckets,proto3" json:"dir_buckets,omitempty"`
 	Cipher      bool     `protobuf:"varint,7,opt,name=cipher,proto3" json:"cipher,omitempty"`
+	Signature   int32    `protobuf:"varint,8,opt,name=signature,proto3" json:"signature,omitempty"`
 }

 func (x *GetFilerConfigurationResponse) Reset() {
@@ -2200,6 +2201,13 @@ func (x *GetFilerConfigurationResponse) GetCipher() bool {
 	return false
 }

+func (x *GetFilerConfigurationResponse) GetSignature() int32 {
+	if x != nil {
+		return x.Signature
+	}
+	return 0
+}
+
 type SubscribeMetadataRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2600,6 +2608,211 @@ func (x *LocateBrokerResponse) GetResources() []*LocateBrokerResponse_Resource {
 	return nil
 }

+// Key-Value operations
+type KvGetRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+}
+
+func (x *KvGetRequest) Reset() {
+	*x = KvGetRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[40]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *KvGetRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*KvGetRequest) ProtoMessage() {}
+
+func (x *KvGetRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[40]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use KvGetRequest.ProtoReflect.Descriptor instead.
+func (*KvGetRequest) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{40}
+}
+
+func (x *KvGetRequest) GetKey() []byte {
+	if x != nil {
+		return x.Key
+	}
+	return nil
+}
+
+type KvGetResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Value []byte `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
+	Error string `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
+}
+
+func (x *KvGetResponse) Reset() {
+	*x = KvGetResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[41]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *KvGetResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*KvGetResponse) ProtoMessage() {}
+
+func (x *KvGetResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[41]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use KvGetResponse.ProtoReflect.Descriptor instead.
+func (*KvGetResponse) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{41}
+}
+
+func (x *KvGetResponse) GetValue() []byte {
+	if x != nil {
+		return x.Value
+	}
+	return nil
+}
+
+func (x *KvGetResponse) GetError() string {
+	if x != nil {
+		return x.Error
+	}
+	return ""
+}
+
+type KvPutRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Key   []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Value []byte `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *KvPutRequest) Reset() {
+	*x = KvPutRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[42]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *KvPutRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*KvPutRequest) ProtoMessage() {}
+
+func (x *KvPutRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[42]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use KvPutRequest.ProtoReflect.Descriptor instead.
+func (*KvPutRequest) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{42}
+}
+
+func (x *KvPutRequest) GetKey() []byte {
+	if x != nil {
+		return x.Key
+	}
+	return nil
+}
+
+func (x *KvPutRequest) GetValue() []byte {
+	if x != nil {
+		return x.Value
+	}
+	return nil
+}
+
+type KvPutResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Error string `protobuf:"bytes,1,opt,name=error,proto3" json:"error,omitempty"`
+}
+
+func (x *KvPutResponse) Reset() {
+	*x = KvPutResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[43]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *KvPutResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*KvPutResponse) ProtoMessage() {}
+
+func (x *KvPutResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[43]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use KvPutResponse.ProtoReflect.Descriptor instead.
+func (*KvPutResponse) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{43}
+}
+
+func (x *KvPutResponse) GetError() string {
+	if x != nil {
+		return x.Error
+	}
+	return ""
+}
+
 // if found, send the exact address
 // if not found, send the full list of existing brokers
 type LocateBrokerResponse_Resource struct {
@@ -2614,7 +2827,7 @@ type LocateBrokerResponse_Resource struct {
 func (x *LocateBrokerResponse_Resource) Reset() {
 	*x = LocateBrokerResponse_Resource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[42]
+		mi := &file_filer_proto_msgTypes[46]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2627,7 +2840,7 @@ func (x *LocateBrokerResponse_Resource) String() string {
 func (*LocateBrokerResponse_Resource) ProtoMessage() {}

 func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[42]
+	mi := &file_filer_proto_msgTypes[46]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2929,7 +3142,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x6e, 0x74, 0x18, 0x06, 0x20, 0x01, 0x28, 0x04, 0x52, 0x09, 0x66, 0x69, 0x6c, 0x65, 0x43, 0x6f,
 	0x75, 0x6e, 0x74, 0x22, 0x1e, 0x0a, 0x1c, 0x47, 0x65, 0x74, 0x46, 0x69, 0x6c, 0x65, 0x72, 0x43,
 	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x71, 0x75,
-	0x65, 0x73, 0x74, 0x22, 0xcb, 0x01, 0x0a, 0x1d, 0x47, 0x65, 0x74, 0x46, 0x69, 0x6c, 0x65, 0x72,
+	0x65, 0x73, 0x74, 0x22, 0xe9, 0x01, 0x0a, 0x1d, 0x47, 0x65, 0x74, 0x46, 0x69, 0x6c, 0x65, 0x72,
 	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x73,
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@@ -2942,151 +3155,172 @@ var file_filer_proto_rawDesc = []byte{
 	0x62, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x73, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0a, 0x64,
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-	0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74,
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-	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75,
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-	0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x61, 0x74, 0x61, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x30, 0x01, 0x12,
+	0x56, 0x0a, 0x0d, 0x4b, 0x65, 0x65, 0x70, 0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x65, 0x64,
+	0x12, 0x1e, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x65, 0x65, 0x70,
+	0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x65, 0x64, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
+	0x1a, 0x1f, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x65, 0x65, 0x70,
+	0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x65, 0x64, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x65, 0x22, 0x00, 0x28, 0x01, 0x30, 0x01, 0x12, 0x4f, 0x0a, 0x0c, 0x4c, 0x6f, 0x63, 0x61, 0x74,
+	0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x12, 0x1d, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f,
+	0x70, 0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x52,
+	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1e, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
+	0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x52, 0x65,
+	0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x3a, 0x0a, 0x05, 0x4b, 0x76, 0x47, 0x65,
+	0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x47,
+	0x65, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17, 0x2e, 0x66, 0x69, 0x6c, 0x65,
+	0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x47, 0x65, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
+	0x73, 0x65, 0x22, 0x00, 0x12, 0x3a, 0x0a, 0x05, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x12, 0x16, 0x2e,
+	0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x52, 0x65,
+	0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62,
+	0x2e, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00,
+	0x42, 0x4f, 0x0a, 0x10, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2e, 0x63, 0x6c,
+	0x69, 0x65, 0x6e, 0x74, 0x42, 0x0a, 0x46, 0x69, 0x6c, 0x65, 0x72, 0x50, 0x72, 0x6f, 0x74, 0x6f,
+	0x5a, 0x2f, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72,
+	0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73,
+	0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
+	0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }

 var (
@@ -3101,7 +3335,7 @@ func file_filer_proto_rawDescGZIP() []byte {
 	return file_filer_proto_rawDescData
 }

-var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 43)
+var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 47)
 var file_filer_proto_goTypes = []interface{}{
 	(*LookupDirectoryEntryRequest)(nil),   // 0: filer_pb.LookupDirectoryEntryRequest
 	(*LookupDirectoryEntryResponse)(nil),  // 1: filer_pb.LookupDirectoryEntryResponse
@@ -3143,16 +3377,20 @@ var file_filer_proto_goTypes = []interface{}{
 	(*KeepConnectedResponse)(nil),         // 37: filer_pb.KeepConnectedResponse
 	(*LocateBrokerRequest)(nil),           // 38: filer_pb.LocateBrokerRequest
 	(*LocateBrokerResponse)(nil),          // 39: filer_pb.LocateBrokerResponse
-	nil,                                   // 40: filer_pb.Entry.ExtendedEntry
-	nil,                                   // 41: filer_pb.LookupVolumeResponse.LocationsMapEntry
-	(*LocateBrokerResponse_Resource)(nil), // 42: filer_pb.LocateBrokerResponse.Resource
+	(*KvGetRequest)(nil),                  // 40: filer_pb.KvGetRequest
+	(*KvGetResponse)(nil),                 // 41: filer_pb.KvGetResponse
+	(*KvPutRequest)(nil),                  // 42: filer_pb.KvPutRequest
+	(*KvPutResponse)(nil),                 // 43: filer_pb.KvPutResponse
+	nil,                                   // 44: filer_pb.Entry.ExtendedEntry
+	nil,                                   // 45: filer_pb.LookupVolumeResponse.LocationsMapEntry
+	(*LocateBrokerResponse_Resource)(nil), // 46: filer_pb.LocateBrokerResponse.Resource
 }
 var file_filer_proto_depIdxs = []int32{
 	4,  // 0: filer_pb.LookupDirectoryEntryResponse.entry:type_name -> filer_pb.Entry
 	4,  // 1: filer_pb.ListEntriesResponse.entry:type_name -> filer_pb.Entry
 	7,  // 2: filer_pb.Entry.chunks:type_name -> filer_pb.FileChunk
 	10, // 3: filer_pb.Entry.attributes:type_name -> filer_pb.FuseAttributes
-	40, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
+	44, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
 	4,  // 5: filer_pb.FullEntry.entry:type_name -> filer_pb.Entry
 	4,  // 6: filer_pb.EventNotification.old_entry:type_name -> filer_pb.Entry
 	4,  // 7: filer_pb.EventNotification.new_entry:type_name -> filer_pb.Entry
@@ -3163,9 +3401,9 @@ var file_filer_proto_depIdxs = []int32{
 	4,  // 12: filer_pb.UpdateEntryRequest.entry:type_name -> filer_pb.Entry
 	7,  // 13: filer_pb.AppendToEntryRequest.chunks:type_name -> filer_pb.FileChunk
 	25, // 14: filer_pb.Locations.locations:type_name -> filer_pb.Location
-	41, // 15: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
+	45, // 15: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
 	6,  // 16: filer_pb.SubscribeMetadataResponse.event_notification:type_name -> filer_pb.EventNotification
-	42, // 17: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
+	46, // 17: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
 	24, // 18: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
 	0,  // 19: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
 	2,  // 20: filer_pb.SeaweedFiler.ListEntries:input_type -> filer_pb.ListEntriesRequest
@@ -3183,24 +3421,28 @@ var file_filer_proto_depIdxs = []int32{
 	33, // 32: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
 	36, // 33: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
 	38, // 34: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
-	1,  // 35: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
-	3,  // 36: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
-	12, // 37: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
-	14, // 38: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
-	16, // 39: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
-	18, // 40: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
-	20, // 41: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
-	22, // 42: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
-	26, // 43: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
-	28, // 44: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
-	30, // 45: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
-	32, // 46: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
-	34, // 47: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	34, // 48: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	37, // 49: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
-	39, // 50: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
-	35, // [35:51] is the sub-list for method output_type
-	19, // [19:35] is the sub-list for method input_type
+	40, // 35: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
+	42, // 36: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
+	1,  // 37: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
+	3,  // 38: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
+	12, // 39: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
+	14, // 40: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
+	16, // 41: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
+	18, // 42: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
+	20, // 43: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
+	22, // 44: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
+	26, // 45: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
+	28, // 46: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
+	30, // 47: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
+	32, // 48: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
+	34, // 49: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	34, // 50: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	37, // 51: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
+	39, // 52: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
+	41, // 53: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
+	43, // 54: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
+	37, // [37:55] is the sub-list for method output_type
+	19, // [19:37] is the sub-list for method input_type
 	19, // [19:19] is the sub-list for extension type_name
 	19, // [19:19] is the sub-list for extension extendee
 	0,  // [0:19] is the sub-list for field type_name
@@ -3692,7 +3934,55 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
+		file_filer_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*KvGetRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*KvGetResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 		file_filer_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*KvPutRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*KvPutResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LocateBrokerResponse_Resource); i {
 			case 0:
 				return &v.state
@@ -3711,7 +4001,7 @@ func file_filer_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_filer_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   43,
+			NumMessages:   47,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
@@ -3753,6 +4043,8 @@ type SeaweedFilerClient interface {
 	SubscribeLocalMetadata(ctx context.Context, in *SubscribeMetadataRequest, opts ...grpc.CallOption) (SeaweedFiler_SubscribeLocalMetadataClient, error)
 	KeepConnected(ctx context.Context, opts ...grpc.CallOption) (SeaweedFiler_KeepConnectedClient, error)
 	LocateBroker(ctx context.Context, in *LocateBrokerRequest, opts ...grpc.CallOption) (*LocateBrokerResponse, error)
+	KvGet(ctx context.Context, in *KvGetRequest, opts ...grpc.CallOption) (*KvGetResponse, error)
+	KvPut(ctx context.Context, in *KvPutRequest, opts ...grpc.CallOption) (*KvPutResponse, error)
 }

 type seaweedFilerClient struct {
@@ -3998,6 +4290,24 @@ func (c *seaweedFilerClient) LocateBroker(ctx context.Context, in *LocateBrokerR
 	return out, nil
 }

+func (c *seaweedFilerClient) KvGet(ctx context.Context, in *KvGetRequest, opts ...grpc.CallOption) (*KvGetResponse, error) {
+	out := new(KvGetResponse)
+	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/KvGet", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *seaweedFilerClient) KvPut(ctx context.Context, in *KvPutRequest, opts ...grpc.CallOption) (*KvPutResponse, error) {
+	out := new(KvPutResponse)
+	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/KvPut", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SeaweedFilerServer is the server API for SeaweedFiler service.
 type SeaweedFilerServer interface {
 	LookupDirectoryEntry(context.Context, *LookupDirectoryEntryRequest) (*LookupDirectoryEntryResponse, error)
@@ -4016,6 +4326,8 @@ type SeaweedFilerServer interface {
 	SubscribeLocalMetadata(*SubscribeMetadataRequest, SeaweedFiler_SubscribeLocalMetadataServer) error
 	KeepConnected(SeaweedFiler_KeepConnectedServer) error
 	LocateBroker(context.Context, *LocateBrokerRequest) (*LocateBrokerResponse, error)
+	KvGet(context.Context, *KvGetRequest) (*KvGetResponse, error)
+	KvPut(context.Context, *KvPutRequest) (*KvPutResponse, error)
 }

 // UnimplementedSeaweedFilerServer can be embedded to have forward compatible implementations.
@@ -4070,6 +4382,12 @@ func (*UnimplementedSeaweedFilerServer) KeepConnected(SeaweedFiler_KeepConnected
 func (*UnimplementedSeaweedFilerServer) LocateBroker(context.Context, *LocateBrokerRequest) (*LocateBrokerResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method LocateBroker not implemented")
 }
+func (*UnimplementedSeaweedFilerServer) KvGet(context.Context, *KvGetRequest) (*KvGetResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method KvGet not implemented")
+}
+func (*UnimplementedSeaweedFilerServer) KvPut(context.Context, *KvPutRequest) (*KvPutResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method KvPut not implemented")
+}

 func RegisterSeaweedFilerServer(s *grpc.Server, srv SeaweedFilerServer) {
 	s.RegisterService(&_SeaweedFiler_serviceDesc, srv)
@@ -4380,6 +4698,42 @@ func _SeaweedFiler_LocateBroker_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }

+func _SeaweedFiler_KvGet_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(KvGetRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).KvGet(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/KvGet",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).KvGet(ctx, req.(*KvGetRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _SeaweedFiler_KvPut_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(KvPutRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).KvPut(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/KvPut",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).KvPut(ctx, req.(*KvPutRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "filer_pb.SeaweedFiler",
 	HandlerType: (*SeaweedFilerServer)(nil),
@@ -4432,6 +4786,14 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			MethodName: "LocateBroker",
 			Handler:    _SeaweedFiler_LocateBroker_Handler,
 		},
+		{
+			MethodName: "KvGet",
+			Handler:    _SeaweedFiler_KvGet_Handler,
+		},
+		{
+			MethodName: "KvPut",
+			Handler:    _SeaweedFiler_KvPut_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
--- a/weed/pb/filer_pb/filer_client.go
+++ b/weed/pb/filer_pb/filer_client.go
@@ -85,11 +85,11 @@ func doList(filerClient FilerClient, fullDirPath util.FullPath, prefix string, f

 		glog.V(4).Infof("read directory: %v", request)
 		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
 		stream, err := client.ListEntries(ctx, request)
 		if err != nil {
 			return fmt.Errorf("list %s: %v", fullDirPath, err)
 		}
-		defer cancel()

 		var prevEntry *Entry
 		for {
@@ -214,7 +214,7 @@ func MkFile(filerClient FilerClient, parentDirectoryPath string, fileName string
 	})
 }

-func Remove(filerClient FilerClient, parentDirectoryPath, name string, isDeleteData, isRecursive, ignoreRecursiveErr, isFromOtherCluster bool, signature int32) error {
+func Remove(filerClient FilerClient, parentDirectoryPath, name string, isDeleteData, isRecursive, ignoreRecursiveErr, isFromOtherCluster bool, signatures []int32) error {
 	return filerClient.WithFilerClient(func(client SeaweedFilerClient) error {

 		deleteEntryRequest := &DeleteEntryRequest{
@@ -224,9 +224,7 @@ func Remove(filerClient FilerClient, parentDirectoryPath, name string, isDeleteD
 			IsRecursive:          isRecursive,
 			IgnoreRecursiveError: ignoreRecursiveErr,
 			IsFromOtherCluster:   isFromOtherCluster,
-		}
-		if signature != 0 {
-			deleteEntryRequest.Signatures = []int32{signature}
+			Signatures:           signatures,
 		}
 		if resp, err := client.DeleteEntry(context.Background(), deleteEntryRequest); err != nil {
 			if strings.Contains(err.Error(), ErrNotFound.Error()) {
--- a/weed/pb/filer_pb/filer_pb_helper.go
+++ b/weed/pb/filer_pb/filer_pb_helper.go
@@ -59,6 +59,15 @@ func BeforeEntrySerialization(chunks []*FileChunk) {
 	}
 }

+func EnsureFid(chunk *FileChunk) {
+	if chunk.Fid != nil {
+		return
+	}
+	if fid, err := ToFileIdObject(chunk.FileId); err == nil {
+		chunk.Fid = fid
+	}
+}
+
 func AfterEntryDeserialization(chunks []*FileChunk) {

 	for _, chunk := range chunks {
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -273,6 +273,7 @@ message GetMasterConfigurationRequest {
 message GetMasterConfigurationResponse {
    string metrics_address = 1;
    uint32 metrics_interval_seconds = 2;
+    repeated StorageBackend storage_backends = 3;
 }

 message ListMasterClientsRequest {
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -2276,8 +2276,9 @@ type GetMasterConfigurationResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields

-	MetricsAddress         string `protobuf:"bytes,1,opt,name=metrics_address,json=metricsAddress,proto3" json:"metrics_address,omitempty"`
-	MetricsIntervalSeconds uint32 `protobuf:"varint,2,opt,name=metrics_interval_seconds,json=metricsIntervalSeconds,proto3" json:"metrics_interval_seconds,omitempty"`
+	MetricsAddress         string            `protobuf:"bytes,1,opt,name=metrics_address,json=metricsAddress,proto3" json:"metrics_address,omitempty"`
+	MetricsIntervalSeconds uint32            `protobuf:"varint,2,opt,name=metrics_interval_seconds,json=metricsIntervalSeconds,proto3" json:"metrics_interval_seconds,omitempty"`
+	StorageBackends        []*StorageBackend `protobuf:"bytes,3,rep,name=storage_backends,json=storageBackends,proto3" json:"storage_backends,omitempty"`
 }

 func (x *GetMasterConfigurationResponse) Reset() {
@@ -2326,6 +2327,13 @@ func (x *GetMasterConfigurationResponse) GetMetricsIntervalSeconds() uint32 {
 	return 0
 }

+func (x *GetMasterConfigurationResponse) GetStorageBackends() []*StorageBackend {
+	if x != nil {
+		return x.StorageBackends
+	}
+	return nil
+}
+
 type ListMasterClientsRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3189,7 +3197,7 @@ var file_master_proto_rawDesc = []byte{
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@@ -3197,115 +3205,120 @@ var file_master_proto_rawDesc = []byte{
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+	0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x60, 0x0a, 0x11, 0x4c, 0x69, 0x73, 0x74, 0x4d, 0x61,
+	0x73, 0x74, 0x65, 0x72, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x73, 0x12, 0x23, 0x2e, 0x6d, 0x61,
+	0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x69, 0x73, 0x74, 0x4d, 0x61, 0x73, 0x74,
+	0x65, 0x72, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
+	0x1a, 0x24, 0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x69, 0x73,
+	0x74, 0x4d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x73, 0x52, 0x65,
+	0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x5a, 0x0a, 0x0f, 0x4c, 0x65, 0x61, 0x73,
+	0x65, 0x41, 0x64, 0x6d, 0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x12, 0x21, 0x2e, 0x6d, 0x61,
+	0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x65, 0x61, 0x73, 0x65, 0x41, 0x64, 0x6d,
+	0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x22,
+	0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x65, 0x61, 0x73, 0x65,
+	0x41, 0x64, 0x6d, 0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
+	0x73, 0x65, 0x22, 0x00, 0x12, 0x60, 0x0a, 0x11, 0x52, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x41,
+	0x64, 0x6d, 0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x12, 0x23, 0x2e, 0x6d, 0x61, 0x73, 0x74,
+	0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x52, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x41, 0x64, 0x6d,
+	0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x24,
+	0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x52, 0x65, 0x6c, 0x65, 0x61,
+	0x73, 0x65, 0x41, 0x64, 0x6d, 0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x65, 0x73, 0x70,
+	0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x32, 0x5a, 0x30, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62,
+	0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73,
+	0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62,
+	0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }

 var (
@@ -3385,39 +3398,40 @@ var file_master_proto_depIdxs = []int32{
 	25, // 15: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
 	26, // 16: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
 	42, // 17: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
-	12, // 18: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
-	12, // 19: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
-	0,  // 20: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
-	8,  // 21: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
-	10, // 22: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
-	13, // 23: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
-	15, // 24: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
-	19, // 25: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
-	21, // 26: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
-	27, // 27: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
-	29, // 28: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
-	31, // 29: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
-	33, // 30: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
-	35, // 31: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
-	37, // 32: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 33: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	9,  // 34: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
-	11, // 35: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	14, // 36: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	16, // 37: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	20, // 38: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	22, // 39: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	28, // 40: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	30, // 41: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	32, // 42: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	34, // 43: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
-	36, // 44: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	38, // 45: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	33, // [33:46] is the sub-list for method output_type
-	20, // [20:33] is the sub-list for method input_type
-	20, // [20:20] is the sub-list for extension type_name
-	20, // [20:20] is the sub-list for extension extendee
-	0,  // [0:20] is the sub-list for field type_name
+	5,  // 18: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
+	12, // 19: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
+	12, // 20: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
+	0,  // 21: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
+	8,  // 22: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
+	10, // 23: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
+	13, // 24: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
+	15, // 25: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
+	19, // 26: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
+	21, // 27: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
+	27, // 28: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
+	29, // 29: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
+	31, // 30: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
+	33, // 31: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
+	35, // 32: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
+	37, // 33: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
+	1,  // 34: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	9,  // 35: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
+	11, // 36: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	14, // 37: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	16, // 38: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	20, // 39: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	22, // 40: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	28, // 41: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	30, // 42: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	32, // 43: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	34, // 44: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
+	36, // 45: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	38, // 46: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	34, // [34:47] is the sub-list for method output_type
+	21, // [21:34] is the sub-list for method input_type
+	21, // [21:21] is the sub-list for extension type_name
+	21, // [21:21] is the sub-list for extension extendee
+	0,  // [0:21] is the sub-list for field type_name
 }

 func init() { file_master_proto_init() }
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -85,6 +85,8 @@ service VolumeServer {

    rpc VolumeServerStatus (VolumeServerStatusRequest) returns (VolumeServerStatusResponse) {
    }
+    rpc VolumeServerLeave (VolumeServerLeaveRequest) returns (VolumeServerLeaveResponse) {
+    }

    // <experimental> query
    rpc Query (QueryRequest) returns (stream QueriedStripe) {
@@ -425,6 +427,11 @@ message VolumeServerStatusResponse {
    MemStatus memory_status = 2;
 }

+message VolumeServerLeaveRequest {
+}
+message VolumeServerLeaveResponse {
+}
+
 // select on volume servers
 message QueryRequest {
    repeated string selections = 1;
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
--- a/weed/replication/replicator.go
+++ b/weed/replication/replicator.go
@@ -3,6 +3,8 @@ package replication
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"google.golang.org/grpc"
 	"strings"

 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -43,28 +45,42 @@ func (r *Replicator) Replicate(ctx context.Context, key string, message *filer_p
 	key = newKey
 	if message.OldEntry != nil && message.NewEntry == nil {
 		glog.V(4).Infof("deleting %v", key)
-		return r.sink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks)
+		return r.sink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
 	}
 	if message.OldEntry == nil && message.NewEntry != nil {
 		glog.V(4).Infof("creating %v", key)
-		return r.sink.CreateEntry(key, message.NewEntry)
+		return r.sink.CreateEntry(key, message.NewEntry, message.Signatures)
 	}
 	if message.OldEntry == nil && message.NewEntry == nil {
 		glog.V(0).Infof("weird message %+v", message)
 		return nil
 	}

-	foundExisting, err := r.sink.UpdateEntry(key, message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks)
+	foundExisting, err := r.sink.UpdateEntry(key, message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks, message.Signatures)
 	if foundExisting {
 		glog.V(4).Infof("updated %v", key)
 		return err
 	}

-	err = r.sink.DeleteEntry(key, message.OldEntry.IsDirectory, false)
+	err = r.sink.DeleteEntry(key, message.OldEntry.IsDirectory, false, message.Signatures)
 	if err != nil {
 		return fmt.Errorf("delete old entry %v: %v", key, err)
 	}

 	glog.V(4).Infof("creating missing %v", key)
-	return r.sink.CreateEntry(key, message.NewEntry)
+	return r.sink.CreateEntry(key, message.NewEntry, message.Signatures)
+}
+
+func ReadFilerSignature(grpcDialOption grpc.DialOption, filer string) (filerSignature int32, readErr error) {
+	if readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		if resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{}); err != nil {
+			return fmt.Errorf("GetFilerConfiguration %s: %v", filer, err)
+		} else {
+			filerSignature = resp.Signature
+		}
+		return nil
+	}); readErr != nil {
+		return 0, readErr
+	}
+	return filerSignature, nil
 }
--- a/weed/replication/sink/azuresink/azure_sink.go
+++ b/weed/replication/sink/azuresink/azure_sink.go
@@ -70,7 +70,7 @@ func (g *AzureSink) initialize(accountName, accountKey, container, dir string) e
 	return nil
 }

-func (g *AzureSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error {
+func (g *AzureSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {

 	key = cleanKey(key)

@@ -87,7 +87,7 @@ func (g *AzureSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks boo

 }

-func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry) error {
+func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int32) error {

 	key = cleanKey(key)

@@ -132,7 +132,7 @@ func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry) error {

 }

-func (g *AzureSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error) {
+func (g *AzureSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {
 	key = cleanKey(key)
 	// TODO improve efficiency
 	return false, nil
--- a/weed/replication/sink/b2sink/b2_sink.go
+++ b/weed/replication/sink/b2sink/b2_sink.go
@@ -57,7 +57,7 @@ func (g *B2Sink) initialize(accountId, accountKey, bucket, dir string) error {
 	return nil
 }

-func (g *B2Sink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error {
+func (g *B2Sink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {

 	key = cleanKey(key)

@@ -76,7 +76,7 @@ func (g *B2Sink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool)

 }

-func (g *B2Sink) CreateEntry(key string, entry *filer_pb.Entry) error {
+func (g *B2Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int32) error {

 	key = cleanKey(key)

@@ -123,7 +123,7 @@ func (g *B2Sink) CreateEntry(key string, entry *filer_pb.Entry) error {

 }

-func (g *B2Sink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error) {
+func (g *B2Sink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {

 	key = cleanKey(key)

--- a/weed/replication/sink/filersink/fetch_write.go
+++ b/weed/replication/sink/filersink/fetch_write.go
@@ -3,6 +3,7 @@ package filersink
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"sync"

 	"google.golang.org/grpc"
@@ -59,11 +60,11 @@ func (fs *FilerSink) replicateOneChunk(sourceChunk *filer_pb.FileChunk, dir stri

 func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk, dir string) (fileId string, err error) {

-	filename, header, readCloser, err := fs.filerSource.ReadPart(sourceChunk.GetFileIdString())
+	filename, header, resp, err := fs.filerSource.ReadPart(sourceChunk.GetFileIdString())
 	if err != nil {
 		return "", fmt.Errorf("read part %s: %v", sourceChunk.GetFileIdString(), err)
 	}
-	defer readCloser.Close()
+	defer util.CloseResponse(resp)

 	var host string
 	var auth security.EncodedJwt
@@ -100,9 +101,9 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk, dir string)
 	glog.V(4).Infof("replicating %s to %s header:%+v", filename, fileUrl, header)

 	// fetch data as is, regardless whether it is encrypted or not
-	uploadResult, err, _ := operation.Upload(fileUrl, filename, false, readCloser, "gzip" == header.Get("Content-Encoding"), header.Get("Content-Type"), nil, auth)
+	uploadResult, err, _ := operation.Upload(fileUrl, filename, false, resp.Body, "gzip" == header.Get("Content-Encoding"), header.Get("Content-Type"), nil, auth)
 	if err != nil {
-		glog.V(0).Infof("upload data %v to %s: %v", filename, fileUrl, err)
+		glog.V(0).Infof("upload source data %v to %s: %v", sourceChunk.GetFileIdString(), fileUrl, err)
 		return "", fmt.Errorf("upload data: %v", err)
 	}
 	if uploadResult.Error != "" {
--- a/weed/replication/sink/filersink/filer_sink.go
+++ b/weed/replication/sink/filersink/filer_sink.go
@@ -25,7 +25,6 @@ type FilerSink struct {
 	ttlSec         int32
 	dataCenter     string
 	grpcDialOption grpc.DialOption
-	signature      int32
 }

 func init() {
@@ -41,37 +40,36 @@ func (fs *FilerSink) GetSinkToDirectory() string {
 }

 func (fs *FilerSink) Initialize(configuration util.Configuration, prefix string) error {
-	return fs.initialize(
+	return fs.DoInitialize(
 		configuration.GetString(prefix+"grpcAddress"),
 		configuration.GetString(prefix+"directory"),
 		configuration.GetString(prefix+"replication"),
 		configuration.GetString(prefix+"collection"),
 		configuration.GetInt(prefix+"ttlSec"),
-	)
+		security.LoadClientTLS(util.GetViper(), "grpc.client"))
 }

 func (fs *FilerSink) SetSourceFiler(s *source.FilerSource) {
 	fs.filerSource = s
 }

-func (fs *FilerSink) initialize(grpcAddress string, dir string,
-	replication string, collection string, ttlSec int) (err error) {
+func (fs *FilerSink) DoInitialize(grpcAddress string, dir string,
+	replication string, collection string, ttlSec int, grpcDialOption grpc.DialOption) (err error) {
 	fs.grpcAddress = grpcAddress
 	fs.dir = dir
 	fs.replication = replication
 	fs.collection = collection
 	fs.ttlSec = int32(ttlSec)
-	fs.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
-	fs.signature = util.RandomInt32()
+	fs.grpcDialOption = grpcDialOption
 	return nil
 }

-func (fs *FilerSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error {
+func (fs *FilerSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {

 	dir, name := util.FullPath(key).DirAndName()

-	glog.V(1).Infof("delete entry: %v", key)
-	err := filer_pb.Remove(fs, dir, name, deleteIncludeChunks, false, false, true, fs.signature)
+	glog.V(4).Infof("delete entry: %v", key)
+	err := filer_pb.Remove(fs, dir, name, deleteIncludeChunks, true, true, true, signatures)
 	if err != nil {
 		glog.V(0).Infof("delete entry %s: %v", key, err)
 		return fmt.Errorf("delete entry %s: %v", key, err)
@@ -79,7 +77,7 @@ func (fs *FilerSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bo
 	return nil
 }

-func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry) error {
+func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int32) error {

 	return fs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

@@ -93,7 +91,7 @@ func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 		glog.V(1).Infof("lookup: %v", lookupRequest)
 		if resp, err := filer_pb.LookupEntry(client, lookupRequest); err == nil {
 			if filer.ETag(resp.Entry) == filer.ETag(entry) {
-				glog.V(0).Infof("already replicated %s", key)
+				glog.V(3).Infof("already replicated %s", key)
 				return nil
 			}
 		}
@@ -101,11 +99,11 @@ func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 		replicatedChunks, err := fs.replicateChunks(entry.Chunks, dir)

 		if err != nil {
-			glog.V(0).Infof("replicate entry chunks %s: %v", key, err)
-			return fmt.Errorf("replicate entry chunks %s: %v", key, err)
+			// only warning here since the source chunk may have been deleted already
+			glog.Warningf("replicate entry chunks %s: %v", key, err)
 		}

-		glog.V(0).Infof("replicated %s %+v ===> %+v", key, entry.Chunks, replicatedChunks)
+		glog.V(4).Infof("replicated %s %+v ===> %+v", key, entry.Chunks, replicatedChunks)

 		request := &filer_pb.CreateEntryRequest{
 			Directory: dir,
@@ -116,10 +114,10 @@ func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 				Chunks:      replicatedChunks,
 			},
 			IsFromOtherCluster: true,
-			Signatures:         []int32{fs.signature},
+			Signatures:         signatures,
 		}

-		glog.V(1).Infof("create: %v", request)
+		glog.V(3).Infof("create: %v", request)
 		if err := filer_pb.CreateEntry(client, request); err != nil {
 			glog.V(0).Infof("create entry %s: %v", key, err)
 			return fmt.Errorf("create entry %s: %v", key, err)
@@ -129,7 +127,7 @@ func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 	})
 }

-func (fs *FilerSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error) {
+func (fs *FilerSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {

 	dir, name := util.FullPath(key).DirAndName()

@@ -158,16 +156,16 @@ func (fs *FilerSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParent
 		return false, fmt.Errorf("lookup %s: %v", key, err)
 	}

-	glog.V(0).Infof("oldEntry %+v, newEntry %+v, existingEntry: %+v", oldEntry, newEntry, existingEntry)
+	glog.V(4).Infof("oldEntry %+v, newEntry %+v, existingEntry: %+v", oldEntry, newEntry, existingEntry)

 	if existingEntry.Attributes.Mtime > newEntry.Attributes.Mtime {
 		// skip if already changed
 		// this usually happens when the messages are not ordered
-		glog.V(0).Infof("late updates %s", key)
+		glog.V(2).Infof("late updates %s", key)
 	} else if filer.ETag(newEntry) == filer.ETag(existingEntry) {
 		// skip if no change
 		// this usually happens when retrying the replication
-		glog.V(0).Infof("already replicated %s", key)
+		glog.V(3).Infof("already replicated %s", key)
 	} else {
 		// find out what changed
 		deletedChunks, newChunks, err := compareChunks(filer.LookupFn(fs), oldEntry, newEntry)
@@ -196,7 +194,7 @@ func (fs *FilerSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParent
 			Directory:          newParentPath,
 			Entry:              existingEntry,
 			IsFromOtherCluster: true,
-			Signatures:         []int32{fs.signature},
+			Signatures:         signatures,
 		}

 		if _, err := client.UpdateEntry(context.Background(), request); err != nil {
--- a/weed/replication/sink/gcssink/gcs_sink.go
+++ b/weed/replication/sink/gcssink/gcs_sink.go
@@ -69,7 +69,7 @@ func (g *GcsSink) initialize(google_application_credentials, bucketName, dir str
 	return nil
 }

-func (g *GcsSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error {
+func (g *GcsSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {

 	if isDirectory {
 		key = key + "/"
@@ -83,7 +83,7 @@ func (g *GcsSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool)

 }

-func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry) error {
+func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int32) error {

 	if entry.IsDirectory {
 		return nil
@@ -119,7 +119,7 @@ func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry) error {

 }

-func (g *GcsSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error) {
+func (g *GcsSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {
 	// TODO improve efficiency
 	return false, nil
 }
--- a/weed/replication/sink/replication_sink.go
+++ b/weed/replication/sink/replication_sink.go
@@ -9,9 +9,9 @@ import (
 type ReplicationSink interface {
 	GetName() string
 	Initialize(configuration util.Configuration, prefix string) error
-	DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error
-	CreateEntry(key string, entry *filer_pb.Entry) error
-	UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error)
+	DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error
+	CreateEntry(key string, entry *filer_pb.Entry, signatures []int32) error
+	UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error)
 	GetSinkToDirectory() string
 	SetSourceFiler(s *source.FilerSource)
 }
--- a/weed/replication/sink/s3sink/s3_sink.go
+++ b/weed/replication/sink/s3sink/s3_sink.go
@@ -83,7 +83,7 @@ func (s3sink *S3Sink) initialize(awsAccessKeyId, awsSecretAccessKey, region, buc
 	return nil
 }

-func (s3sink *S3Sink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool) error {
+func (s3sink *S3Sink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {

 	key = cleanKey(key)

@@ -95,7 +95,7 @@ func (s3sink *S3Sink) DeleteEntry(key string, isDirectory, deleteIncludeChunks b

 }

-func (s3sink *S3Sink) CreateEntry(key string, entry *filer_pb.Entry) error {
+func (s3sink *S3Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int32) error {
 	key = cleanKey(key)

 	if entry.IsDirectory {
@@ -136,7 +136,7 @@ func (s3sink *S3Sink) CreateEntry(key string, entry *filer_pb.Entry) error {

 }

-func (s3sink *S3Sink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool) (foundExistingEntry bool, err error) {
+func (s3sink *S3Sink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {
 	key = cleanKey(key)
 	// TODO improve efficiency
 	return false, nil
--- a/weed/replication/source/filer_source.go
+++ b/weed/replication/source/filer_source.go
@@ -28,13 +28,13 @@ type FilerSource struct {
 }

 func (fs *FilerSource) Initialize(configuration util.Configuration, prefix string) error {
-	return fs.initialize(
+	return fs.DoInitialize(
 		configuration.GetString(prefix+"grpcAddress"),
 		configuration.GetString(prefix+"directory"),
 	)
 }

-func (fs *FilerSource) initialize(grpcAddress string, dir string) (err error) {
+func (fs *FilerSource) DoInitialize(grpcAddress string, dir string) (err error) {
 	fs.grpcAddress = grpcAddress
 	fs.Dir = dir
 	fs.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
@@ -79,16 +79,16 @@ func (fs *FilerSource) LookupFileId(part string) (fileUrl string, err error) {
 	return
 }

-func (fs *FilerSource) ReadPart(part string) (filename string, header http.Header, readCloser io.ReadCloser, err error) {
+func (fs *FilerSource) ReadPart(part string) (filename string, header http.Header, resp *http.Response, err error) {

 	fileUrl, err := fs.LookupFileId(part)
 	if err != nil {
 		return "", nil, nil, err
 	}

-	filename, header, readCloser, err = util.DownloadFile(fileUrl)
+	filename, header, resp, err = util.DownloadFile(fileUrl)

-	return filename, header, readCloser, err
+	return filename, header, resp, err
 }

 var _ = filer_pb.FilerClient(&FilerSource{})
--- a/weed/s3api/filer_multipart.go
+++ b/weed/s3api/filer_multipart.go
@@ -56,7 +56,7 @@ func (s3a *S3ApiServer) completeMultipartUpload(input *s3.CompleteMultipartUploa

 	uploadDirectory := s3a.genUploadsFolder(*input.Bucket) + "/" + *input.UploadId

-	entries, err := s3a.list(uploadDirectory, "", "", false, 0)
+	entries, _, err := s3a.list(uploadDirectory, "", "", false, 0)
 	if err != nil || len(entries) == 0 {
 		glog.Errorf("completeMultipartUpload %s %s error: %v, entries:%d", *input.Bucket, *input.UploadId, err, len(entries))
 		return nil, ErrNoSuchUpload
@@ -140,35 +140,50 @@ func (s3a *S3ApiServer) abortMultipartUpload(input *s3.AbortMultipartUploadInput

 type ListMultipartUploadsResult struct {
 	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListMultipartUploadsResult"`
-	s3.ListMultipartUploadsOutput
+
+	// copied from s3.ListMultipartUploadsOutput, the Uploads is not converting to <Upload></Upload>
+	Bucket             *string               `type:"string"`
+	Delimiter          *string               `type:"string"`
+	EncodingType       *string               `type:"string" enum:"EncodingType"`
+	IsTruncated        *bool                 `type:"boolean"`
+	KeyMarker          *string               `type:"string"`
+	MaxUploads         *int64                `type:"integer"`
+	NextKeyMarker      *string               `type:"string"`
+	NextUploadIdMarker *string               `type:"string"`
+	Prefix             *string               `type:"string"`
+	UploadIdMarker     *string               `type:"string"`
+	Upload             []*s3.MultipartUpload `locationName:"Upload" type:"list" flattened:"true"`
 }

 func (s3a *S3ApiServer) listMultipartUploads(input *s3.ListMultipartUploadsInput) (output *ListMultipartUploadsResult, code ErrorCode) {
+	// https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListMultipartUploads.html

 	output = &ListMultipartUploadsResult{
-		ListMultipartUploadsOutput: s3.ListMultipartUploadsOutput{
-			Bucket:       input.Bucket,
-			Delimiter:    input.Delimiter,
-			EncodingType: input.EncodingType,
-			KeyMarker:    input.KeyMarker,
-			MaxUploads:   input.MaxUploads,
-			Prefix:       input.Prefix,
-		},
+		Bucket:       input.Bucket,
+		Delimiter:    input.Delimiter,
+		EncodingType: input.EncodingType,
+		KeyMarker:    input.KeyMarker,
+		MaxUploads:   input.MaxUploads,
+		Prefix:       input.Prefix,
 	}

-	entries, err := s3a.list(s3a.genUploadsFolder(*input.Bucket), *input.Prefix, *input.KeyMarker, true, uint32(*input.MaxUploads))
+	entries, isLast, err := s3a.list(s3a.genUploadsFolder(*input.Bucket), *input.Prefix, *input.KeyMarker, true, uint32(*input.MaxUploads))
 	if err != nil {
 		glog.Errorf("listMultipartUploads %s error: %v", *input.Bucket, err)
 		return
 	}
+	output.IsTruncated = aws.Bool(!isLast)

 	for _, entry := range entries {
 		if entry.Extended != nil {
 			key := entry.Extended["key"]
-			output.Uploads = append(output.Uploads, &s3.MultipartUpload{
+			output.Upload = append(output.Upload, &s3.MultipartUpload{
 				Key:      objectKey(aws.String(string(key))),
 				UploadId: aws.String(entry.Name),
 			})
+			if !isLast {
+				output.NextUploadIdMarker = aws.String(entry.Name)
+			}
 		}
 	}

@@ -177,26 +192,39 @@ func (s3a *S3ApiServer) listMultipartUploads(input *s3.ListMultipartUploadsInput

 type ListPartsResult struct {
 	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListPartsResult"`
-	s3.ListPartsOutput
+
+	// copied from s3.ListPartsOutput, the Parts is not converting to <Part></Part>
+	Bucket               *string    `type:"string"`
+	IsTruncated          *bool      `type:"boolean"`
+	Key                  *string    `min:"1" type:"string"`
+	MaxParts             *int64     `type:"integer"`
+	NextPartNumberMarker *int64     `type:"integer"`
+	PartNumberMarker     *int64     `type:"integer"`
+	Part                 []*s3.Part `locationName:"Part" type:"list" flattened:"true"`
+	StorageClass         *string    `type:"string" enum:"StorageClass"`
+	UploadId             *string    `type:"string"`
 }

 func (s3a *S3ApiServer) listObjectParts(input *s3.ListPartsInput) (output *ListPartsResult, code ErrorCode) {
+	// https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListParts.html
+
 	output = &ListPartsResult{
-		ListPartsOutput: s3.ListPartsOutput{
-			Bucket:           input.Bucket,
-			Key:              objectKey(input.Key),
-			UploadId:         input.UploadId,
-			MaxParts:         input.MaxParts,         // the maximum number of parts to return.
-			PartNumberMarker: input.PartNumberMarker, // the part number starts after this, exclusive
-		},
+		Bucket:           input.Bucket,
+		Key:              objectKey(input.Key),
+		UploadId:         input.UploadId,
+		MaxParts:         input.MaxParts,         // the maximum number of parts to return.
+		PartNumberMarker: input.PartNumberMarker, // the part number starts after this, exclusive
+		StorageClass:     aws.String("STANDARD"),
 	}

-	entries, err := s3a.list(s3a.genUploadsFolder(*input.Bucket)+"/"+*input.UploadId, "", fmt.Sprintf("%04d.part", *input.PartNumberMarker), false, uint32(*input.MaxParts))
+	entries, isLast, err := s3a.list(s3a.genUploadsFolder(*input.Bucket)+"/"+*input.UploadId, "", fmt.Sprintf("%04d.part", *input.PartNumberMarker), false, uint32(*input.MaxParts))
 	if err != nil {
 		glog.Errorf("listObjectParts %s %s error: %v", *input.Bucket, *input.UploadId, err)
 		return nil, ErrNoSuchUpload
 	}

+	output.IsTruncated = aws.Bool(!isLast)
+
 	for _, entry := range entries {
 		if strings.HasSuffix(entry.Name, ".part") && !entry.IsDirectory {
 			partNumberString := entry.Name[:len(entry.Name)-len(".part")]
@@ -205,12 +233,15 @@ func (s3a *S3ApiServer) listObjectParts(input *s3.ListPartsInput) (output *ListP
 				glog.Errorf("listObjectParts %s %s parse %s: %v", *input.Bucket, *input.UploadId, entry.Name, err)
 				continue
 			}
-			output.Parts = append(output.Parts, &s3.Part{
+			output.Part = append(output.Part, &s3.Part{
 				PartNumber:   aws.Int64(int64(partNumber)),
 				LastModified: aws.Time(time.Unix(entry.Attributes.Mtime, 0).UTC()),
 				Size:         aws.Int64(int64(filer.FileSize(entry))),
 				ETag:         aws.String("\"" + filer.ETag(entry) + "\""),
 			})
+			if !isLast {
+				output.NextPartNumberMarker = aws.Int64(int64(partNumber))
+			}
 		}
 	}

--- a/weed/s3api/filer_multipart_test.go
+++ b/weed/s3api/filer_multipart_test.go
@@ -4,6 +4,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"testing"
+	"time"
 )

 func TestInitiateMultipartUploadResult(t *testing.T) {
@@ -24,3 +25,25 @@ func TestInitiateMultipartUploadResult(t *testing.T) {
 	}

 }
+
+func TestListPartsResult(t *testing.T) {
+
+	expected := `<?xml version="1.0" encoding="UTF-8"?>
+<ListPartsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Part><ETag>&#34;12345678&#34;</ETag><LastModified>1970-01-01T00:00:00Z</LastModified><PartNumber>1</PartNumber><Size>123</Size></Part></ListPartsResult>`
+	response := &ListPartsResult{
+		Part: []*s3.Part{
+			{
+				PartNumber:   aws.Int64(int64(1)),
+				LastModified: aws.Time(time.Unix(0, 0).UTC()),
+				Size:         aws.Int64(int64(123)),
+				ETag:         aws.String("\"12345678\""),
+			},
+		},
+	}
+
+	encoded := string(encodeResponse(response))
+	if encoded != expected {
+		t.Errorf("unexpected output: %s\nexpecting:%s", encoded, expected)
+	}
+
+}
--- a/weed/s3api/filer_util.go
+++ b/weed/s3api/filer_util.go
@@ -21,10 +21,13 @@ func (s3a *S3ApiServer) mkFile(parentDirectoryPath string, fileName string, chun

 }

-func (s3a *S3ApiServer) list(parentDirectoryPath, prefix, startFrom string, inclusive bool, limit uint32) (entries []*filer_pb.Entry, err error) {
+func (s3a *S3ApiServer) list(parentDirectoryPath, prefix, startFrom string, inclusive bool, limit uint32) (entries []*filer_pb.Entry, isLast bool, err error) {

-	err = filer_pb.List(s3a, parentDirectoryPath, prefix, func(entry *filer_pb.Entry, isLast bool) error {
+	err = filer_pb.List(s3a, parentDirectoryPath, prefix, func(entry *filer_pb.Entry, isLastEntry bool) error {
 		entries = append(entries, entry)
+		if isLastEntry {
+			isLast = true
+		}
 		return nil
 	}, startFrom, inclusive, limit)

--- a/weed/s3api/s3api_bucket_handlers.go
+++ b/weed/s3api/s3api_bucket_handlers.go
@@ -25,7 +25,7 @@ func (s3a *S3ApiServer) ListBucketsHandler(w http.ResponseWriter, r *http.Reques

 	var response ListAllMyBucketsResult

-	entries, err := s3a.list(s3a.option.BucketsPath, "", "", false, math.MaxInt32)
+	entries, _, err := s3a.list(s3a.option.BucketsPath, "", "", false, math.MaxInt32)

 	if err != nil {
 		writeErrorResponse(w, ErrInternalError, r.URL)
--- a/weed/s3api/s3api_object_copy_handlers.go
+++ b/weed/s3api/s3api_object_copy_handlers.go
@@ -39,14 +39,14 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request
 	srcUrl := fmt.Sprintf("http://%s%s/%s%s",
 		s3a.option.Filer, s3a.option.BucketsPath, srcBucket, srcObject)

-	_, _, dataReader, err := util.DownloadFile(srcUrl)
+	_, _, resp, err := util.DownloadFile(srcUrl)
 	if err != nil {
 		writeErrorResponse(w, ErrInvalidCopySource, r.URL)
 		return
 	}
-	defer dataReader.Close()
+	defer util.CloseResponse(resp)

-	etag, errCode := s3a.putToFiler(r, dstUrl, dataReader)
+	etag, errCode := s3a.putToFiler(r, dstUrl, resp.Body)

 	if errCode != ErrNone {
 		writeErrorResponse(w, errCode, r.URL)
--- a/weed/s3api/s3api_objects_list_handlers.go
+++ b/weed/s3api/s3api_objects_list_handlers.go
@@ -212,7 +212,9 @@ func (s3a *S3ApiServer) doListFilerEntries(client filer_pb.SeaweedFilerClient, d
 		InclusiveStartFrom: false,
 	}

-	stream, listErr := client.ListEntries(context.Background(), request)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	stream, listErr := client.ListEntries(ctx, request)
 	if listErr != nil {
 		err = fmt.Errorf("list entires %+v: %v", request, listErr)
 		return
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -314,7 +314,7 @@ func (fs *FilerServer) DeleteEntry(ctx context.Context, req *filer_pb.DeleteEntr

 	glog.V(4).Infof("DeleteEntry %v", req)

-	err = fs.filer.DeleteEntryMetaAndData(ctx, util.JoinPath(req.Directory, req.Name), req.IsRecursive, req.IgnoreRecursiveError, req.IsDeleteData, req.IsFromOtherCluster, nil)
+	err = fs.filer.DeleteEntryMetaAndData(ctx, util.JoinPath(req.Directory, req.Name), req.IsRecursive, req.IgnoreRecursiveError, req.IsDeleteData, req.IsFromOtherCluster, req.Signatures)
 	resp = &filer_pb.DeleteEntryResponse{}
 	if err != nil {
 		resp.Error = err.Error()
@@ -426,6 +426,7 @@ func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.
 		MaxMb:       uint32(fs.option.MaxMB),
 		DirBuckets:  fs.filer.DirBucketsPath,
 		Cipher:      fs.filer.Cipher,
+		Signature:   fs.filer.Signature,
 	}

 	glog.V(4).Infof("GetFilerConfiguration: %v", t)
--- a/weed/server/filer_grpc_server_kv.go
+++ b/weed/server/filer_grpc_server_kv.go
@@ -0,0 +1,42 @@
+package weed_server
+
+import (
+	"context"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func (fs *FilerServer) KvGet(ctx context.Context, req *filer_pb.KvGetRequest) (*filer_pb.KvGetResponse, error) {
+
+	value, err := fs.filer.Store.KvGet(ctx, req.Key)
+	if err == filer.ErrKvNotFound {
+		return &filer_pb.KvGetResponse{}, nil
+	}
+
+	if err != nil {
+		return &filer_pb.KvGetResponse{Error: err.Error()}, nil
+	}
+
+	return &filer_pb.KvGetResponse{
+		Value: value,
+	}, nil
+
+}
+
+// KvPut sets the key~value. if empty value, delete the kv entry
+func (fs *FilerServer) KvPut(ctx context.Context, req *filer_pb.KvPutRequest) (*filer_pb.KvPutResponse, error) {
+
+	if len(req.Value) == 0 {
+		if err := fs.filer.Store.KvDelete(ctx, req.Key); err != nil {
+			return &filer_pb.KvPutResponse{Error: err.Error()}, nil
+		}
+	}
+
+	err := fs.filer.Store.KvPut(ctx, req.Key, req.Value)
+	if err != nil {
+		return &filer_pb.KvPutResponse{Error: err.Error()}, nil
+	}
+
+	return &filer_pb.KvPutResponse{}, nil
+
+}
--- a/weed/server/filer_grpc_server_sub_meta.go
+++ b/weed/server/filer_grpc_server_sub_meta.go
@@ -2,6 +2,7 @@ package weed_server

 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util/log_buffer"
 	"strings"
 	"time"

@@ -24,7 +25,7 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 	lastReadTime := time.Unix(0, req.SinceNs)
 	glog.V(0).Infof(" %v starts to subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)

-	eachEventNotificationFn := eachEventNotificationFn(req, stream, clientName, req.Signature)
+	eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName, req.Signature)

 	eachLogEntryFn := eachLogEntryFn(eachEventNotificationFn)

@@ -37,12 +38,21 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 		lastReadTime = time.Unix(0, processedTsNs)
 	}

-	err = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData(lastReadTime, func() bool {
-		fs.filer.MetaAggregator.ListenersLock.Lock()
-		fs.filer.MetaAggregator.ListenersCond.Wait()
-		fs.filer.MetaAggregator.ListenersLock.Unlock()
-		return true
-	}, eachLogEntryFn)
+	for {
+		lastReadTime, err = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData(lastReadTime, func() bool {
+			fs.filer.MetaAggregator.ListenersLock.Lock()
+			fs.filer.MetaAggregator.ListenersCond.Wait()
+			fs.filer.MetaAggregator.ListenersLock.Unlock()
+			return true
+		}, eachLogEntryFn)
+		if err != nil {
+			glog.Errorf("processed to %v: %v", lastReadTime, err)
+			time.Sleep(3127 * time.Millisecond)
+			if err != log_buffer.ResumeError {
+				break
+			}
+		}
+	}

 	return err

@@ -59,30 +69,37 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 	lastReadTime := time.Unix(0, req.SinceNs)
 	glog.V(0).Infof(" %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)

-	eachEventNotificationFn := eachEventNotificationFn(req, stream, clientName, req.Signature)
+	eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName, req.Signature)

 	eachLogEntryFn := eachLogEntryFn(eachEventNotificationFn)

-	if _, ok := fs.filer.Store.ActualStore.(filer.FilerLocalStore); ok {
-		// println("reading from persisted logs ...")
-		processedTsNs, err := fs.filer.ReadPersistedLogBuffer(lastReadTime, eachLogEntryFn)
-		if err != nil {
-			return fmt.Errorf("reading from persisted logs: %v", err)
-		}
-
-		if processedTsNs != 0 {
-			lastReadTime = time.Unix(0, processedTsNs)
-		}
-		glog.V(0).Infof("after local log reads, %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
+	// println("reading from persisted logs ...")
+	processedTsNs, err := fs.filer.ReadPersistedLogBuffer(lastReadTime, eachLogEntryFn)
+	if err != nil {
+		return fmt.Errorf("reading from persisted logs: %v", err)
 	}

+	if processedTsNs != 0 {
+		lastReadTime = time.Unix(0, processedTsNs)
+	}
+	glog.V(0).Infof("after local log reads, %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
+
 	// println("reading from in memory logs ...")
-	err := fs.filer.LocalMetaLogBuffer.LoopProcessLogData(lastReadTime, func() bool {
-		fs.listenersLock.Lock()
-		fs.listenersCond.Wait()
-		fs.listenersLock.Unlock()
-		return true
-	}, eachLogEntryFn)
+	for {
+		lastReadTime, err = fs.filer.LocalMetaLogBuffer.LoopProcessLogData(lastReadTime, func() bool {
+			fs.listenersLock.Lock()
+			fs.listenersCond.Wait()
+			fs.listenersLock.Unlock()
+			return true
+		}, eachLogEntryFn)
+		if err != nil {
+			glog.Errorf("processed to %v: %v", lastReadTime, err)
+			time.Sleep(3127 * time.Millisecond)
+			if err != log_buffer.ResumeError {
+				break
+			}
+		}
+	}

 	return err

@@ -104,13 +121,20 @@ func eachLogEntryFn(eachEventNotificationFn func(dirPath string, eventNotificati
 	}
 }

-func eachEventNotificationFn(req *filer_pb.SubscribeMetadataRequest, stream filer_pb.SeaweedFiler_SubscribeMetadataServer, clientName string, clientSignature int32) func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error {
+func (fs *FilerServer) eachEventNotificationFn(req *filer_pb.SubscribeMetadataRequest, stream filer_pb.SeaweedFiler_SubscribeMetadataServer, clientName string, clientSignature int32) func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error {
 	return func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error {

+		foundSelf := false
 		for _, sig := range eventNotification.Signatures {
 			if sig == clientSignature && clientSignature != 0 {
 				return nil
 			}
+			if sig == fs.filer.Signature {
+				foundSelf = true
+			}
+		}
+		if !foundSelf {
+			eventNotification.Signatures = append(eventNotification.Signatures, fs.filer.Signature)
 		}

 		// get complete path to the file or directory
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -20,6 +20,7 @@ import (

 	"github.com/chrislusf/seaweedfs/weed/filer"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/cassandra"
+	_ "github.com/chrislusf/seaweedfs/weed/filer/elastic/v7"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/etcd"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/leveldb"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/leveldb2"
@@ -156,10 +157,7 @@ func maybeStartMetrics(fs *FilerServer, option *FilerOption) {
 	if metricsAddress == "" && metricsIntervalSec <= 0 {
 		return
 	}
-	go stats.LoopPushingMetric("filer", stats.SourceName(option.Port), stats.FilerGather,
-		func() (addr string, intervalSeconds int) {
-			return metricsAddress, metricsIntervalSec
-		})
+	go stats.LoopPushingMetric("filer", stats.SourceName(option.Port), stats.FilerGather, metricsAddress, metricsIntervalSec)
 }

 func readFilerConfiguration(grpcDialOption grpc.DialOption, masterAddress string) (metricsAddress string, metricsIntervalSec int, err error) {
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -3,6 +3,7 @@ package weed_server
 import (
 	"context"
 	"crypto/md5"
+	"fmt"
 	"hash"
 	"io"
 	"io/ioutil"
@@ -46,7 +47,11 @@ func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *
 	var err error
 	var md5bytes []byte
 	if r.Method == "POST" {
-		reply, md5bytes, err = fs.doPostAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, ttlSec, ttlString, fsync)
+		if r.Header.Get("Content-Type") == "" && strings.HasSuffix(r.URL.Path, "/") {
+			reply, err = fs.mkdir(ctx, w, r)
+		} else {
+			reply, md5bytes, err = fs.doPostAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, ttlSec, ttlString, fsync)
+		}
 	} else {
 		reply, md5bytes, err = fs.doPutAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, ttlSec, ttlString, fsync)
 	}
@@ -254,3 +259,52 @@ func (fs *FilerServer) saveAsChunk(replication string, collection string, dataCe
 		return uploadResult.ToPbFileChunk(fileId, offset), collection, replication, nil
 	}
 }
+
+func (fs *FilerServer) mkdir(ctx context.Context, w http.ResponseWriter, r *http.Request) (filerResult *FilerPostResult, replyerr error) {
+
+	// detect file mode
+	modeStr := r.URL.Query().Get("mode")
+	if modeStr == "" {
+		modeStr = "0660"
+	}
+	mode, err := strconv.ParseUint(modeStr, 8, 32)
+	if err != nil {
+		glog.Errorf("Invalid mode format: %s, use 0660 by default", modeStr)
+		mode = 0660
+	}
+
+	// fix the path
+	path := r.URL.Path
+	if strings.HasSuffix(path, "/") {
+		path = path[:len(path)-1]
+	}
+
+	existingEntry, err := fs.filer.FindEntry(ctx, util.FullPath(path))
+	if err == nil && existingEntry != nil {
+		replyerr = fmt.Errorf("dir %s already exists", path)
+		return
+	}
+
+	glog.V(4).Infoln("mkdir", path)
+	entry := &filer.Entry{
+		FullPath: util.FullPath(path),
+		Attr: filer.Attr{
+			Mtime:  time.Now(),
+			Crtime: time.Now(),
+			Mode:   os.FileMode(mode) | os.ModeDir,
+			Uid:    OS_UID,
+			Gid:    OS_GID,
+		},
+	}
+
+	filerResult = &FilerPostResult{
+		Name: util.FullPath(path).Name(),
+	}
+
+	if dbErr := fs.filer.CreateEntry(ctx, entry, false, false, nil); dbErr != nil {
+		replyerr = dbErr
+		filerResult.Error = dbErr.Error()
+		glog.V(0).Infof("failing to create dir %s on filer server : %v", path, dbErr)
+	}
+	return filerResult, replyerr
+}
--- a/Show More
+++ b/Show More