gsh-digital-services/seaweedFS
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add volume tailer

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This commit is contained in:
Chris Lu
2019-04-18 11:05:02 -07:00
parent b142f9f1d5
commit 3dce1016cb
4 changed files with 228 additions and 148 deletions
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56
weed/server/volume_grpc_stream_follow.go
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@@ -9,57 +9,63 @@ import (
"github.com/chrislusf/seaweedfs/weed/storage"
)
func (vs *VolumeServer) VolumeStreamFollow(req *volume_server_pb.VolumeStreamFollowRequest, stream volume_server_pb.VolumeServer_VolumeStreamFollowServer) error {
func (vs *VolumeServer) VolumeTail(req *volume_server_pb.VolumeTailRequest, stream volume_server_pb.VolumeServer_VolumeTailServer) error {
v := vs.store.GetVolume(storage.VolumeId(req.VolumeId))
if v == nil {
return fmt.Errorf("not found volume id %d", req.VolumeId)
}
defer glog.V(1).Infof("tailing volume %d finished", v.Id)
lastTimestampNs := req.SinceNs
drainingSeconds := req.DrainingSeconds
ticker := time.NewTicker(time.Second)
for {
select {
case <-ticker.C:
lastProcessedTimestampNs, err := sendNeedlesSince(stream, v, lastTimestampNs)
if err != nil {
return fmt.Errorf("streamFollow: %v", err)
}
if req.DrainingSeconds == 0 {
continue
}
if lastProcessedTimestampNs == lastTimestampNs {
drainingSeconds--
if drainingSeconds <= 0 {
return nil
}
glog.V(0).Infof("volume %d drains requests with %d seconds remaining ...", v.Id, drainingSeconds)
} else {
drainingSeconds = req.DrainingSeconds
glog.V(0).Infof("volume %d resets draining wait time to %d seconds", v.Id, drainingSeconds)
}
lastProcessedTimestampNs, err := sendNeedlesSince(stream, v, lastTimestampNs)
if err != nil {
glog.Infof("sendNeedlesSince: %v", err)
return fmt.Errorf("streamFollow: %v", err)
}
time.Sleep(2 * time.Second)
if req.DrainingSeconds == 0 {
continue
}
if lastProcessedTimestampNs == lastTimestampNs {
drainingSeconds--
if drainingSeconds <= 0 {
return nil
}
glog.V(1).Infof("tailing volume %d drains requests with %d seconds remaining", v.Id, drainingSeconds)
} else {
lastTimestampNs = lastProcessedTimestampNs
drainingSeconds = req.DrainingSeconds
glog.V(1).Infof("tailing volume %d resets draining wait time to %d seconds", v.Id, drainingSeconds)
}
}
}
func sendNeedlesSince(stream volume_server_pb.VolumeServer_VolumeStreamFollowServer, v *storage.Volume, lastTimestampNs uint64) (lastProcessedTimestampNs uint64, err error) {
func sendNeedlesSince(stream volume_server_pb.VolumeServer_VolumeTailServer, v *storage.Volume, lastTimestampNs uint64) (lastProcessedTimestampNs uint64, err error) {
foundOffset, isLastOne, err := v.BinarySearchByAppendAtNs(lastTimestampNs)
if err != nil {
return 0, fmt.Errorf("fail to locate by appendAtNs %d: %s", lastTimestampNs, err)
}
// log.Printf("reading ts %d offset %d isLast %v", lastTimestampNs, foundOffset, isLastOne)
if isLastOne {
return lastTimestampNs, nil
// need to heart beat to the client to ensure the connection health
sendErr := stream.Send(&volume_server_pb.VolumeTailResponse{})
return lastTimestampNs, sendErr
}
err = storage.ScanVolumeFileNeedleFrom(v.Version(), v.DataFile(), foundOffset.ToAcutalOffset(), func(needleHeader, needleBody []byte, needleAppendAtNs uint64) error {
sendErr := stream.Send(&volume_server_pb.VolumeStreamFollowResponse{
sendErr := stream.Send(&volume_server_pb.VolumeTailResponse{
NeedleHeader: needleHeader,
NeedleBody: needleBody,
})