switch to multi collection, change readme

weed/filer/arangodb/readme.md

@@ -3,7 +3,6 @@
 database: https://github.com/arangodb/arangodb
 go driver: https://github.com/arangodb/go-driver
 
-
 options:
 
 ```
@@ -11,40 +10,43 @@ options:
 enabled=true
 db_name="seaweedfs"
 servers=["http://localhost:8529"]
+#basic auth
 user="root"
 pass="test"
 
-# whether to enable fulltext index
-# this allows for directory prefix query
-fulltext=true
-
 # tls settings
 insecure_skip_verify=true
 ```
 
-supports buckets with an extra field in document.
-omitempty means extra space is not used.
-
-i test with
+i test using this dev database:
 `docker run -p 8529:8529 -e ARANGO_ROOT_PASSWORD=test arangodb/arangodb:3.9.0`
 
 
-## todo
-
-performance test
+## features i don't personally need but are missing
+ [ ] provide tls cert to arango
+ [ ] authentication that is not basic auth
+ [ ] synchronise endpoint interval config
+ [ ] automatic creation of custom index
+ [ ] configure default arangodb collection sharding rules
+ [ ] configure default arangodb collection replication rules
 
 
-## thoughts
-
-should there be one collection per bucket? this would make deleting a bucket O(1) instead of O(n)
-
-
-## comparison
+## complexity
 
 ok, so if https://www.arangodb.com/docs/stable/indexing-index-basics.html#persistent-index is correct
 
-it should be log time to the number of files in the directory
+O(1)
+- InsertEntry
+- UpdateEntry
+- FindEntry
+- DeleteEntry
+- KvPut
+- KvGet
+- KvDelete
 
-and constant time if you have full directory + file
+O(log(BUCKET_SIZE))
+- DeleteFolderChildren
 
-deleting a folder should be log time to number of folders + files that need to be deleted
+O(log(DIRECTORY_SIZE))
+- ListDirectoryEntries
+- ListDirectoryPrefixedEntries