filer: able to tail meta data changes

11 files changed, 366 insertions, 179 deletions

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 3975b517d..12f1cd85b 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -237,7 +237,7 @@ message GetFilerConfigurationResponse {
 message ListenForEventsRequest {
     string client_name = 1;
     string directory = 2;
-    int64 since_sec = 3;
+    int64 since_ns = 3;
 }
 message FullEventNotification {
     string directory = 1;
diff --git a/weed/command/command.go b/weed/command/command.go
index 9dc51e922..a82f3cdd0 100644
--- a/weed/command/command.go
+++ b/weed/command/command.go
@@ -12,21 +12,22 @@ var Commands = []*Command{
 	cmdBackup,
 	cmdCompact,
 	cmdCopy,
-	cmdFix,
+	cmdDownload,
+	cmdExport,
+	cmdFiler,
 	cmdFilerReplicate,
-	cmdServer,
+	cmdFix,
 	cmdMaster,
-	cmdFiler,
+	cmdMount,
 	cmdS3,
-	cmdUpload,
-	cmdDownload,
 	cmdMsgBroker,
 	cmdScaffold,
+	cmdServer,
 	cmdShell,
+	cmdTail,
+	cmdUpload,
 	cmdVersion,
 	cmdVolume,
-	cmdExport,
-	cmdMount,
 	cmdWebDav,
 }
 
diff --git a/weed/command/tail.go b/weed/command/tail.go
new file mode 100644
index 000000000..e81a4cfe2
--- /dev/null
+++ b/weed/command/tail.go
@@ -0,0 +1,63 @@
+package command
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func init() {
+	cmdTail.Run = runTail // break init cycle
+}
+
+var cmdTail = &Command{
+	UsageLine: "tail <wip> [-filer=localhost:8888]",
+	Short:     "see recent changes on a filer",
+	Long: `See recent changes on a filer.
+
+  `,
+}
+
+var (
+	tailFiler  = cmdTail.Flag.String("filer", "localhost:8888", "filer hostname:port")
+	tailTarget = cmdTail.Flag.String("target", "/", "a folder or file on filer")
+)
+
+func runTail(cmd *Command, args []string) bool {
+
+	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+
+	tailErr := pb.WithFilerClient(*tailFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		stream, err := client.ListenForEvents(context.Background(), &filer_pb.ListenForEventsRequest{
+			ClientName: "tail",
+			Directory:  *tailTarget,
+			SinceNs:    0,
+		})
+		if err != nil {
+			return fmt.Errorf("listen: %v", err)
+		}
+
+		for {
+			resp, listenErr := stream.Recv()
+			if listenErr == io.EOF {
+				return nil
+			}
+			if listenErr != nil {
+				return listenErr
+			}
+			fmt.Printf("events: %+v\n", resp.EventNotification)
+		}
+
+	})
+	if tailErr != nil {
+		fmt.Printf("tail %s: %v\n", *tailFiler, tailErr)
+	}
+
+	return true
+}
diff --git a/weed/filer2/filer.go b/weed/filer2/filer.go
index 014eb19e9..a2689f39f 100644
--- a/weed/filer2/filer.go
+++ b/weed/filer2/filer.go
@@ -39,14 +39,14 @@ type Filer struct {
 	metaLogBuffer       *queue.LogBuffer
 }
 
-func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerGrpcPort uint32) *Filer {
+func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerGrpcPort uint32, notifyFn func()) *Filer {
 	f := &Filer{
 		directoryCache:      ccache.New(ccache.Configure().MaxSize(1000).ItemsToPrune(100)),
 		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerGrpcPort, masters),
 		fileIdDeletionQueue: util.NewUnboundedQueue(),
 		GrpcDialOption:      grpcDialOption,
 	}
-	f.metaLogBuffer = queue.NewLogBuffer(time.Minute, f.logFlushFunc)
+	f.metaLogBuffer = queue.NewLogBuffer(time.Minute, f.logFlushFunc, notifyFn)
 
 	go f.loopProcessingDeletion()
 
diff --git a/weed/filer2/filer_notify.go b/weed/filer2/filer_notify.go
index e808e45f0..402d87313 100644
--- a/weed/filer2/filer_notify.go
+++ b/weed/filer2/filer_notify.go
@@ -77,3 +77,40 @@ func (f *Filer) logFlushFunc(startTime, stopTime time.Time, buf []byte) {
 	}
 }
 
+func (f *Filer) ReadLogBuffer(lastReadTime time.Time, eachEventFn func(fullpath string, eventNotification *filer_pb.EventNotification) error) (newLastReadTime time.Time, err error) {
+
+	var buf []byte
+	newLastReadTime, buf = f.metaLogBuffer.ReadFromBuffer(lastReadTime)
+
+	for pos := 0; pos+4 < len(buf); {
+
+		size := util.BytesToUint32(buf[pos : pos+4])
+		entryData := buf[pos+4 : pos+4+int(size)]
+
+		logEntry := &filer_pb.LogEntry{}
+		err = proto.Unmarshal(entryData, logEntry)
+		if err != nil {
+			glog.Errorf("unexpected unmarshal filer_pb.LogEntry: %v", err)
+			return lastReadTime, fmt.Errorf("unexpected unmarshal filer_pb.LogEntry: %v", err)
+		}
+
+		event := &filer_pb.FullEventNotification{}
+		err = proto.Unmarshal(logEntry.Data, event)
+		if err != nil {
+			glog.Errorf("unexpected unmarshal filer_pb.FullEventNotification: %v", err)
+			return lastReadTime, fmt.Errorf("unexpected unmarshal filer_pb.FullEventNotification: %v", err)
+		}
+
+		err = eachEventFn(event.Directory, event.EventNotification)
+
+		if err != nil {
+			return
+		}
+
+		pos += 4 + int(size)
+
+	}
+
+	return
+
+}
diff --git a/weed/operation/grpc_client.go b/weed/operation/grpc_client.go
index dccf85da4..025a65b38 100644
--- a/weed/operation/grpc_client.go
+++ b/weed/operation/grpc_client.go
@@ -9,6 +9,7 @@ import (
 
 	"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/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 )
@@ -17,7 +18,7 @@ func WithVolumeServerClient(volumeServer string, grpcDialOption grpc.DialOption,
 
 	grpcAddress, err := toVolumeServerGrpcAddress(volumeServer)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to parse volume server %v: %v", volumeServer, err)
 	}
 
 	return pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
@@ -41,7 +42,7 @@ func WithMasterServerClient(masterServer string, grpcDialOption grpc.DialOption,
 
 	masterGrpcAddress, parseErr := pb.ParseServerToGrpcAddress(masterServer)
 	if parseErr != nil {
-		return fmt.Errorf("failed to parse master grpc %v: %v", masterServer, parseErr)
+		return fmt.Errorf("failed to parse master %v: %v", masterServer, parseErr)
 	}
 
 	return pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
@@ -50,3 +51,17 @@ func WithMasterServerClient(masterServer string, grpcDialOption grpc.DialOption,
 	}, masterGrpcAddress, grpcDialOption)
 
 }
+
+func WithFilerServerClient(filerServer string, grpcDialOption grpc.DialOption, fn func(masterClient filer_pb.SeaweedFilerClient) error) error {
+
+	filerGrpcAddress, parseErr := pb.ParseServerToGrpcAddress(filerServer)
+	if parseErr != nil {
+		return fmt.Errorf("failed to parse filer %v: %v", filerGrpcAddress, parseErr)
+	}
+
+	return pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
+		client := filer_pb.NewSeaweedFilerClient(grpcConnection)
+		return fn(client)
+	}, filerGrpcAddress, grpcDialOption)
+
+}
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 3975b517d..12f1cd85b 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -237,7 +237,7 @@ message GetFilerConfigurationResponse {
 message ListenForEventsRequest {
     string client_name = 1;
     string directory = 2;
-    int64 since_sec = 3;
+    int64 since_ns = 3;
 }
 message FullEventNotification {
     string directory = 1;
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 461a575b5..c927c0f87 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1093,7 +1093,7 @@ func (m *GetFilerConfigurationResponse) GetCipher() bool {
 type ListenForEventsRequest struct {
 	ClientName string `protobuf:"bytes,1,opt,name=client_name,json=clientName" json:"client_name,omitempty"`
 	Directory  string `protobuf:"bytes,2,opt,name=directory" json:"directory,omitempty"`
-	SinceSec   int64  `protobuf:"varint,3,opt,name=since_sec,json=sinceSec" json:"since_sec,omitempty"`
+	SinceNs    int64  `protobuf:"varint,3,opt,name=since_ns,json=sinceNs" json:"since_ns,omitempty"`
 }
 
 func (m *ListenForEventsRequest) Reset()                    { *m = ListenForEventsRequest{} }
@@ -1115,9 +1115,9 @@ func (m *ListenForEventsRequest) GetDirectory() string {
 	return ""
 }
 
-func (m *ListenForEventsRequest) GetSinceSec() int64 {
+func (m *ListenForEventsRequest) GetSinceNs() int64 {
 	if m != nil {
-		return m.SinceSec
+		return m.SinceNs
 	}
 	return 0
 }
@@ -1709,122 +1709,122 @@ func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 var fileDescriptor0 = []byte{
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+	0xcc, 0x73, 0x6e, 0xc3, 0xa8, 0xa2, 0x5a, 0xdb, 0xe1, 0xfc, 0xcb, 0x02, 0xf2, 0x12, 0xb1, 0xe4,
+	0xfb, 0xb5, 0x71, 0x55, 0xdd, 0xaa, 0xc5, 0x68, 0xac, 0x0a, 0x7d, 0xe9, 0xe7, 0x0d, 0x70, 0xc0,
+	0x84, 0xd6, 0xff, 0xd2, 0x97, 0x7e, 0xde, 0x88, 0x38, 0x0d, 0x32, 0xae, 0x7a, 0x22, 0x26, 0x21,
+	0x36, 0x22, 0xb7, 0x20, 0x91, 0x8f, 0xe1, 0x0e, 0x9b, 0xc6, 0x09, 0xa7, 0x73, 0x31, 0x4f, 0xbb,
+	0xaa, 0x83, 0xc2, 0x6b, 0x9a, 0x5b, 0x1e, 0xd8, 0x45, 0xcf, 0x3d, 0x81, 0x51, 0xe5, 0x19, 0x57,
+	0xba, 0xf9, 0xcf, 0x16, 0x8c, 0x9f, 0xcb, 0x64, 0xc6, 0x02, 0x97, 0x2a, 0xe3, 0x2b, 0x4f, 0x7f,
+	0x08, 0x43, 0x85, 0xe6, 0x8b, 0xcf, 0x1f, 0x24, 0x51, 0x38, 0xef, 0x96, 0x77, 0x41, 0x01, 0xba,
+	0x67, 0x78, 0xa1, 0x9b, 0x44, 0x21, 0x66, 0xe2, 0x43, 0x50, 0xa8, 0x6b, 0x9c, 0xd7, 0x73, 0xc3,
+	0x20, 0xa6, 0x67, 0x95, 0xf3, 0x4a, 0x08, 0xcf, 0x6b, 0xa8, 0xee, 0xc6, 0xf4, 0x4c, 0x9d, 0x77,
+	0xee, 0xc1, 0xdd, 0x25, 0xb6, 0xe5, 0xe1, 0xfa, 0xb7, 0x05, 0xa3, 0xe7, 0x42, 0xb0, 0x69, 0xfc,
+	0x5b, 0x84, 0x9d, 0xc2, 0xe8, 0x35, 0x68, 0x07, 0x49, 0x16, 0x4b, 0x34, 0xb6, 0xed, 0xea, 0xcd,
+	0x42, 0x25, 0x36, 0x6a, 0x95, 0xb8, 0x50, 0xcb, 0xcd, 0x7a, 0x2d, 0x1b, 0xb5, 0xda, 0xaa, 0xd4,
+	0xea, 0x03, 0xe8, 0xab, 0x20, 0x7b, 0x01, 0x8d, 0x25, 0xe5, 0x39, 0xce, 0x83, 0x22, 0xed, 0x20,
+	0x45, 0x09, 0x98, 0xfd, 0x48, 0x43, 0x3d, 0xa4, 0xf3, 0x66, 0xf4, 0x1f, 0x0b, 0xd6, 0xaa, 0x4f,
+	0xc9, 0x63, 0x76, 0x69, 0x5f, 0x52, 0x50, 0xc6, 0xa3, 0xfc, 0x1d, 0x6a, 0xa9, 0x40, 0x21, 0xcd,
+	0x0e, 0x23, 0x16, 0x78, 0x8a, 0xa1, 0xed, 0xb7, 0x35, 0xe5, 0x3d, 0x8f, 0xe6, 0x5e, 0x69, 0x99,
+	0x5e, 0x21, 0xd0, 0xf2, 0x33, 0x79, 0x5c, 0xf4, 0x26, 0xb5, 0x5e, 0xf0, 0x54, 0xe7, 0x3a, 0x4f,
+	0x75, 0xeb, 0x9e, 0x2a, 0x33, 0xad, 0x67, 0x66, 0xda, 0xc7, 0x30, 0xd2, 0xc3, 0x6d, 0x35, 0x5c,
+	0x1b, 0x00, 0x65, 0x1f, 0x11, 0x63, 0x4b, 0x83, 0x59, 0xd1, 0x48, 0x84, 0xf3, 0x4b, 0xb0, 0x5f,
+	0x27, 0x5a, 0xaf, 0x20, 0xcf, 0xc0, 0x8e, 0x8a, 0x0d, 0x8a, 0xf6, 0xb7, 0xc9, 0xbc, 0xc6, 0x0b,
+	0x39, 0x77, 0x2e, 0xe4, 0x7c, 0x06, 0xbd, 0x82, 0x5c, 0xf8, 0xcc, 0xba, 0xcc, 0x67, 0x8d, 0x05,
+	0x9f, 0x39, 0xff, 0xb4, 0x60, 0xad, 0x6a, 0x72, 0x1e, 0x96, 0xf7, 0x30, 0x2c, 0xaf, 0xf0, 0x66,
+	0x7e, 0x9a, 0xdb, 0xf2, 0xcc, 0xb4, 0xa5, 0x7e, 0xac, 0x34, 0x50, 0xbc, 0xf1, 0x53, 0x9d, 0xcb,
+	0x83, 0xc8, 0x20, 0x4d, 0xde, 0xc1, 0x6a, 0x4d, 0x64, 0xc9, 0x64, 0xf7, 0x13, 0x73, 0xb2, 0xab,
+	0x4c, 0xa7, 0xe5, 0x69, 0x73, 0xdc, 0xfb, 0x14, 0x3e, 0xd0, 0x70, 0xb0, 0x53, 0xc6, 0xb0, 0xf0,
+	0x7d, 0x35, 0xd4, 0xd6, 0x62, 0xa8, 0x9d, 0x09, 0x8c, 0xeb, 0x47, 0xf3, 0xf2, 0x9b, 0xc2, 0xea,
+	0x81, 0xf4, 0x25, 0x13, 0x92, 0x05, 0xe5, 0x27, 0xc6, 0x42, 0x6e, 0x58, 0xd7, 0x75, 0xc4, 0x7a,
+	0x1d, 0xae, 0x40, 0x53, 0xca, 0x22, 0x7f, 0xd5, 0x52, 0x45, 0x81, 0x98, 0x37, 0xe5, 0x31, 0xf8,
+	0x01, 0xae, 0x52, 0xf9, 0x20, 0x13, 0xe9, 0x47, 0x7a, 0xe2, 0x68, 0xe1, 0xc4, 0x61, 0x23, 0x05,
+	0x47, 0x0e, 0xdd, 0x94, 0x43, 0xcd, 0x6d, 0xeb, 0x79, 0x44, 0x11, 0x90, 0xb9, 0x01, 0x80, 0xa5,
+	0xaa, 0xab, 0xac, 0xa3, 0xcf, 0x2a, 0xca, 0x8e, 0x22, 0x38, 0xf7, 0x61, 0xfd, 0x73, 0x2a, 0xd5,
+	0xec, 0xc4, 0x77, 0x92, 0xf8, 0x88, 0x4d, 0x33, 0xee, 0x1b, 0xa1, 0x70, 0xfe, 0x6b, 0xc1, 0xc6,
+	0x25, 0x02, 0xf9, 0x83, 0xc7, 0xd0, 0x9d, 0xf9, 0x42, 0x52, 0x5e, 0x54, 0x49, 0xb1, 0x5d, 0x74,
+	0x45, 0xe3, 0x3a, 0x57, 0x34, 0x6b, 0xae, 0xb8, 0x0d, 0x9d, 0x99, 0x7f, 0xee, 0xcd, 0x0e, 0xf3,
+	0xe1, 0xa8, 0x3d, 0xf3, 0xcf, 0xdf, 0x1c, 0x22, 0xb2, 0x31, 0xee, 0x1d, 0x66, 0xc1, 0x09, 0x95,
+	0xa2, 0x44, 0x36, 0xc6, 0x5f, 0x68, 0x8a, 0x7a, 0xb4, 0x12, 0xf8, 0x3a, 0xa3, 0x19, 0x15, 0x39,
+	0x56, 0xa8, 0xe6, 0xf8, 0x1b, 0x24, 0xe0, 0x30, 0x85, 0x93, 0x25, 0xa2, 0x44, 0xcf, 0xcd, 0x77,
+	0x0e, 0x87, 0x3b, 0xea, 0xfb, 0x8e, 0xc6, 0x7b, 0x09, 0xc7, 0x6f, 0x88, 0x32, 0x81, 0x1e, 0x40,
+	0x3f, 0x88, 0x98, 0x82, 0x4a, 0xe3, 0xc3, 0x0d, 0x34, 0x09, 0x5b, 0x4a, 0xa5, 0x1b, 0x37, 0x16,
+	0xbb, 0xf1, 0x5d, 0xe8, 0x09, 0x16, 0x07, 0xd4, 0x8b, 0xf5, 0xd7, 0x41, 0xd3, 0xed, 0xe2, 0x7e,
+	0x5f, 0x38, 0x7f, 0xb2, 0xe0, 0x36, 0x7e, 0xf6, 0xd4, 0xbe, 0x59, 0xae, 0x6e, 0xf0, 0xbf, 0x06,
+	0x42, 0x4f, 0xd1, 0x20, 0xe3, 0x4c, 0x5e, 0x7a, 0xf7, 0x8c, 0x01, 0x63, 0x51, 0xad, 0xbb, 0x4a,
+	0x17, 0x49, 0x8e, 0xaf, 0xd0, 0x68, 0xaa, 0xeb, 0x7a, 0x04, 0x6d, 0x29, 0x3c, 0xc4, 0x31, 0x65,
+	0x67, 0x4b, 0x8a, 0x7d, 0x41, 0x9e, 0x02, 0x49, 0x7d, 0x2e, 0x99, 0x92, 0x56, 0xc3, 0xb3, 0x77,
+	0xec, 0x8b, 0x63, 0xbc, 0xac, 0xed, 0xae, 0x94, 0x9c, 0x2f, 0xe8, 0xc5, 0xaf, 0x7c, 0x71, 0xac,
+	0xd0, 0x1b, 0xa7, 0x8b, 0x26, 0x0e, 0xf1, 0xb8, 0xde, 0xfe, 0x6b, 0x0f, 0x06, 0x07, 0xd4, 0x3f,
+	0xa3, 0x34, 0xc4, 0x5c, 0x22, 0xd3, 0x02, 0xc3, 0xaa, 0xff, 0x14, 0xc8, 0xa3, 0x45, 0xb0, 0x5a,
+	0xfa, 0x13, 0x63, 0xf2, 0xd1, 0x75, 0x62, 0x39, 0x1c, 0xdc, 0x20, 0xfb, 0xd0, 0x37, 0x3e, 0xda,
+	0xc9, 0xba, 0x71, 0xb0, 0xf6, 0x2f, 0x62, 0xb2, 0x71, 0x09, 0xb7, 0xd0, 0xf6, 0xcc, 0x22, 0xaf,
+	0xa1, 0x6f, 0x4c, 0x8b, 0xa6, 0xbe, 0xfa, 0xd8, 0x6a, 0xea, 0x5b, 0x32, 0x62, 0x3a, 0x37, 0x94,
+	0x36, 0x63, 0xe6, 0x33, 0xb5, 0xd5, 0xa7, 0x4c, 0x53, 0xdb, 0xb2, 0x41, 0x11, 0xb5, 0x19, 0x23,
+	0x96, 0xa9, 0xad, 0x3e, 0x40, 0x9a, 0xda, 0x96, 0xcc, 0x65, 0xce, 0x0d, 0xf2, 0x07, 0x58, 0xad,
+	0x8d, 0x39, 0xc4, 0x99, 0x9f, 0xba, 0x6c, 0x3e, 0x9b, 0x3c, 0xbc, 0x52, 0xa6, 0xd4, 0xff, 0x25,
+	0x0c, 0xcc, 0xe9, 0x82, 0x18, 0x06, 0x2d, 0x19, 0xa0, 0x26, 0xf7, 0x2f, 0x63, 0x9b, 0x0a, 0xcd,
+	0x06, 0x67, 0x2a, 0x5c, 0xd2, 0xe2, 0x4d, 0x85, 0xcb, 0xfa, 0xa2, 0x73, 0x83, 0xfc, 0x1e, 0x56,
+	0x16, 0x1b, 0x0d, 0xf9, 0x70, 0xd1, 0x6d, 0xb5, 0xfe, 0x35, 0x71, 0xae, 0x12, 0x29, 0x95, 0xbf,
+	0x02, 0x98, 0xf7, 0x0f, 0x62, 0xd4, 0x6c, 0xad, 0x7f, 0x4d, 0xd6, 0x97, 0x33, 0x4b, 0x55, 0x7f,
+	0x84, 0xdb, 0x4b, 0x41, 0x9a, 0x18, 0x65, 0x72, 0x15, 0xcc, 0x4f, 0x7e, 0x7c, 0xad, 0x5c, 0x79,
+	0xd7, 0x57, 0x70, 0x6b, 0x01, 0x24, 0xc9, 0x66, 0xb5, 0x6a, 0xea, 0xf8, 0x39, 0x79, 0x60, 0xfe,
+	0x79, 0x5a, 0x02, 0x76, 0xaa, 0xb2, 0x5e, 0xdc, 0x87, 0x15, 0xa1, 0x21, 0xe2, 0x48, 0x6c, 0x69,
+	0x6c, 0x7d, 0x01, 0x68, 0xcb, 0x5b, 0x9e, 0xc8, 0xe4, 0xb0, 0x83, 0x3f, 0x3a, 0x7f, 0xf6, 0xff,
+	0x00, 0x00, 0x00, 0xff, 0xff, 0x2f, 0x77, 0xbb, 0xcb, 0xf7, 0x14, 0x00, 0x00,
 }
diff --git a/weed/queue/log_buffer.go b/weed/queue/log_buffer.go
index d6ccdf2a6..6ed2a719c 100644
--- a/weed/queue/log_buffer.go
+++ b/weed/queue/log_buffer.go
@@ -6,28 +6,32 @@ import (
 
 	"github.com/golang/protobuf/proto"
 
+	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 type LogBuffer struct {
 	buf           []byte
+	idx           []int
 	pos           int
 	startTime     time.Time
 	stopTime      time.Time
 	sizeBuf       []byte
 	flushInterval time.Duration
 	flushFn       func(startTime, stopTime time.Time, buf []byte)
+	notifyFn      func()
 	isStopping    bool
-	sync.Mutex
+	sync.RWMutex
 }
 
-func NewLogBuffer(flushInterval time.Duration, flushFn func(startTime, stopTime time.Time, buf []byte)) *LogBuffer {
+func NewLogBuffer(flushInterval time.Duration, flushFn func(startTime, stopTime time.Time, buf []byte), notifyFn func()) *LogBuffer {
 	lb := &LogBuffer{
 		buf:           make([]byte, 4*0124*1024),
 		sizeBuf:       make([]byte, 4),
 		flushInterval: flushInterval,
 		flushFn:       flushFn,
+		notifyFn:      notifyFn,
 	}
 	go lb.loopFlush()
 	return lb
@@ -46,7 +50,12 @@ func (m *LogBuffer) AddToBuffer(ts time.Time, key, data []byte) {
 	size := len(logEntryData)
 
 	m.Lock()
-	defer m.Unlock()
+	defer func() {
+		m.Unlock()
+		if m.notifyFn != nil {
+			m.notifyFn()
+		}
+	}()
 
 	if m.pos == 0 {
 		m.startTime = ts
@@ -55,12 +64,15 @@ func (m *LogBuffer) AddToBuffer(ts time.Time, key, data []byte) {
 	if m.startTime.Add(m.flushInterval).Before(ts) || len(m.buf)-m.pos < size+4 {
 		m.flush()
 		m.startTime = ts
+		if len(m.buf) < size+4 {
+			m.buf = make([]byte, 2*size+4)
+		}
 	}
 	m.stopTime = ts
 
+	m.idx = append(m.idx, m.pos)
 	util.Uint32toBytes(m.sizeBuf, uint32(size))
 	copy(m.buf[m.pos:m.pos+4], m.sizeBuf)
-
 	copy(m.buf[m.pos+4:m.pos+4+size], logEntryData)
 	m.pos += size + 4
 }
@@ -88,5 +100,67 @@ func (m *LogBuffer) flush() {
 	if m.flushFn != nil && m.pos > 0 {
 		m.flushFn(m.startTime, m.stopTime, m.buf[:m.pos])
 		m.pos = 0
+		m.idx = m.idx[:0]
+	}
+}
+
+func (m *LogBuffer) ReadFromBuffer(lastReadTime time.Time) (ts time.Time, bufferCopy []byte) {
+	m.RLock()
+	defer m.RUnlock()
+
+	// fmt.Printf("read from buffer: %v\n", lastReadTime)
+
+	if lastReadTime.Equal(m.stopTime) {
+		return lastReadTime, nil
+	}
+	if lastReadTime.After(m.stopTime) {
+		// glog.Fatalf("unexpected last read time %v, older than latest %v", lastReadTime, m.stopTime)
+		return lastReadTime, nil
 	}
+	if lastReadTime.Before(m.startTime) {
+		return m.stopTime, copiedBytes(m.buf[:m.pos])
+	}
+
+	lastTs := lastReadTime.UnixNano()
+	l, h := 0, len(m.idx)-1
+
+	// fmt.Printf("l=%d, h=%d\n", l, h)
+	for {
+		mid := (l + h) / 2
+		pos := m.idx[mid]
+		t := readTs(m.buf, m.idx[mid])
+		if t <= lastTs {
+			l = mid + 1
+		} else if lastTs < t {
+			var prevT int64
+			if mid > 0 {
+				prevT = readTs(m.buf, m.idx[mid-1])
+			}
+			if prevT <= lastTs {
+				return time.Unix(0, t), copiedBytes(m.buf[pos:m.pos])
+			}
+			h = mid - 1
+		}
+		// fmt.Printf("l=%d, h=%d\n", l, h)
+	}
+
+}
+func copiedBytes(buf []byte) (copied []byte) {
+	copied = make([]byte, len(buf))
+	copy(copied, buf)
+	return
+}
+
+func readTs(buf []byte, pos int) int64 {
+
+	size := util.BytesToUint32(buf[pos : pos+4])
+	entryData := buf[pos+4 : pos+4+int(size)]
+	logEntry := &filer_pb.LogEntry{}
+
+	err := proto.Unmarshal(entryData, logEntry)
+	if err != nil {
+		glog.Fatalf("unexpected unmarshal filer_pb.LogEntry: %v", err)
+	}
+	return logEntry.TsNs
+
 }
diff --git a/weed/server/filer_grpc_server_listen.go b/weed/server/filer_grpc_server_listen.go
index 37d643ce2..81b0a9254 100644
--- a/weed/server/filer_grpc_server_listen.go
+++ b/weed/server/filer_grpc_server_listen.go
@@ -1,6 +1,9 @@
 package weed_server
 
 import (
+	"strings"
+	"time"
+
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 )
@@ -9,62 +12,56 @@ func (fs *FilerServer) ListenForEvents(req *filer_pb.ListenForEventsRequest, str
 
 	peerAddress := findClientAddress(stream.Context(), 0)
 
-	clientName, messageChan := fs.addClient(req.ClientName, peerAddress)
+	clientName := fs.addClient(req.ClientName, peerAddress)
 
-	defer fs.deleteClient(clientName, messageChan)
+	defer fs.deleteClient(clientName)
 
-	// ts := time.Unix(req.SinceSec, 0)
+	lastReadTime := time.Now()
+	if req.SinceNs > 0 {
+		lastReadTime = time.Unix(0, req.SinceNs)
+	}
+	var readErr error
+	for {
 
-	// iterate through old messages
-	/*
-		for _, message := range ms.Topo.ToVolumeLocations() {
+		lastReadTime, readErr = fs.filer.ReadLogBuffer(lastReadTime, func(fullpath string, eventNotification *filer_pb.EventNotification) error {
+			if strings.HasPrefix(fullpath, "/.meta") {
+				return nil
+			}
+			if !strings.HasPrefix(fullpath, req.Directory) {
+				return nil
+			}
+			message := &filer_pb.FullEventNotification{
+				Directory:         fullpath,
+				EventNotification: eventNotification,
+			}
 			if err := stream.Send(message); err != nil {
 				return err
 			}
+			return nil
+		})
+		if readErr != nil {
+			glog.V(0).Infof("=> client %v: %+v", clientName, readErr)
+			return readErr
 		}
-	*/
-
-	// need to add a buffer here to avoid slow clients
-	// also needs to support millions of clients
 
-	for message := range messageChan {
-		if err := stream.Send(message); err != nil {
-			glog.V(0).Infof("=> client %v: %+v", clientName, message)
-			return err
-		}
+		fs.listenersLock.Lock()
+		fs.listenersCond.Wait()
+		fs.listenersLock.Unlock()
 	}
 
 	return nil
 }
 
-func (fs *FilerServer) addClient(clientType string, clientAddress string) (clientName string, messageChan chan *filer_pb.FullEventNotification) {
+func (fs *FilerServer) addClient(clientType string, clientAddress string) (clientName string) {
 	clientName = clientType + "@" + clientAddress
 	glog.V(0).Infof("+ listener %v", clientName)
-
-	messageChan = make(chan *filer_pb.FullEventNotification, 10)
-
-	fs.clientChansLock.Lock()
-	fs.clientChans[clientName] = messageChan
-	fs.clientChansLock.Unlock()
 	return
 }
 
-func (fs *FilerServer) deleteClient(clientName string, messageChan chan *filer_pb.FullEventNotification) {
+func (fs *FilerServer) deleteClient(clientName string) {
 	glog.V(0).Infof("- listener %v", clientName)
-	close(messageChan)
-	fs.clientChansLock.Lock()
-	delete(fs.clientChans, clientName)
-	fs.clientChansLock.Unlock()
 }
 
-func (fs *FilerServer) sendMessageToClients(dir string, eventNotification *filer_pb.EventNotification) {
-	message := &filer_pb.FullEventNotification{
-		Directory:         dir,
-		EventNotification: eventNotification,
-	}
-	fs.clientChansLock.RLock()
-	for _, ch := range fs.clientChans {
-		ch <- message
-	}
-	fs.clientChansLock.RUnlock()
+func (fs *FilerServer) notifyMetaListeners() {
+	fs.listenersCond.Broadcast()
 }
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index ba7b0ed03..22bbd2a03 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -12,7 +12,6 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -57,8 +56,8 @@ type FilerServer struct {
 	grpcDialOption grpc.DialOption
 
 	// notifying clients
-	clientChansLock sync.RWMutex
-	clientChans     map[string]chan *filer_pb.FullEventNotification
+	listenersLock sync.Mutex
+	listenersCond *sync.Cond
 }
 
 func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption) (fs *FilerServer, err error) {
@@ -67,12 +66,13 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		option:         option,
 		grpcDialOption: security.LoadClientTLS(util.GetViper(), "grpc.filer"),
 	}
+	fs.listenersCond = sync.NewCond(&fs.listenersLock)
 
 	if len(option.Masters) == 0 {
 		glog.Fatal("master list is required!")
 	}
 
-	fs.filer = filer2.NewFiler(option.Masters, fs.grpcDialOption, option.Port+10000)
+	fs.filer = filer2.NewFiler(option.Masters, fs.grpcDialOption, option.Port+10000, fs.notifyMetaListeners)
 	fs.filer.Cipher = option.Cipher
 
 	maybeStartMetrics(fs, option)