add filer notification

13 files changed, 428 insertions, 101 deletions

diff --git a/weed/command/filer.go b/weed/command/filer.go
index 17f2fbdcf..d42db6418 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -32,6 +32,7 @@ type FilerOptions struct {
 	secretKey               *string
 	dirListingLimit         *int
 	dataCenter              *string
+	enableNotification      *bool
 }
 
 func init() {
@@ -49,6 +50,7 @@ func init() {
 	f.secretKey = cmdFiler.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 1000, "limit sub dir listing size")
 	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to write to volumes in this data center")
+	f.enableNotification = cmdFiler.Flag.Bool("notify", false, "send file updates to the queue defined in message_queue.toml")
 }
 
 var cmdFiler = &Command{
@@ -90,14 +92,15 @@ func (fo *FilerOptions) start() {
 
 	fs, nfs_err := weed_server.NewFilerServer(defaultMux, publicVolumeMux, &weed_server.FilerOption{
 		Masters:            strings.Split(*f.masters, ","),
-		Collection:         *f.collection,
-		DefaultReplication: *f.defaultReplicaPlacement,
-		RedirectOnRead:     *f.redirectOnRead,
-		DisableDirListing:  *f.disableDirListing,
-		MaxMB:              *f.maxMB,
-		SecretKey:          *f.secretKey,
-		DirListingLimit:    *f.dirListingLimit,
-		DataCenter:         *f.dataCenter,
+		Collection:         *fo.collection,
+		DefaultReplication: *fo.defaultReplicaPlacement,
+		RedirectOnRead:     *fo.redirectOnRead,
+		DisableDirListing:  *fo.disableDirListing,
+		MaxMB:              *fo.maxMB,
+		SecretKey:          *fo.secretKey,
+		DirListingLimit:    *fo.dirListingLimit,
+		DataCenter:         *fo.dataCenter,
+		EnableNotification: *fo.enableNotification,
 	})
 	if nfs_err != nil {
 		glog.Fatalf("Filer startup error: %v", nfs_err)
@@ -127,9 +130,9 @@ func (fo *FilerOptions) start() {
 	}
 
 	// starting grpc server
-	grpcPort := *f.grpcPort
+	grpcPort := *fo.grpcPort
 	if grpcPort == 0 {
-		grpcPort = *f.port + 10000
+		grpcPort = *fo.port + 10000
 	}
 	grpcL, err := util.NewListener(":"+strconv.Itoa(grpcPort), 0)
 	if err != nil {
diff --git a/weed/command/server.go b/weed/command/server.go
index b0c6a1ed5..bef5e635e 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -84,12 +84,14 @@ func init() {
 	serverOptions.cpuprofile = cmdServer.Flag.String("cpuprofile", "", "cpu profile output file")
 	filerOptions.collection = cmdServer.Flag.String("filer.collection", "", "all data will be stored in this collection")
 	filerOptions.port = cmdServer.Flag.Int("filer.port", 8888, "filer server http listen port")
+	filerOptions.grpcPort = cmdServer.Flag.Int("filer.port.grpc", 0, "filer grpc server listen port, default to http port + 10000")
 	filerOptions.publicPort = cmdServer.Flag.Int("filer.port.public", 0, "filer server public http listen port")
 	filerOptions.defaultReplicaPlacement = cmdServer.Flag.String("filer.defaultReplicaPlacement", "", "Default replication type if not specified during runtime.")
 	filerOptions.redirectOnRead = cmdServer.Flag.Bool("filer.redirectOnRead", false, "whether proxy or redirect to volume server during file GET request")
 	filerOptions.disableDirListing = cmdServer.Flag.Bool("filer.disableDirListing", false, "turn off directory listing")
 	filerOptions.maxMB = cmdServer.Flag.Int("filer.maxMB", 32, "split files larger than the limit")
 	filerOptions.dirListingLimit = cmdServer.Flag.Int("filer.dirListLimit", 1000, "limit sub dir listing size")
+	filerOptions.enableNotification = cmdServer.Flag.Bool("filer.notify", false, "send file updates to the queue defined in message_queue.toml")
 }
 
 func runServer(cmd *Command, args []string) bool {
diff --git a/weed/filer2/entry_codec.go b/weed/filer2/entry_codec.go
index 671568b75..baa6a9440 100644
--- a/weed/filer2/entry_codec.go
+++ b/weed/filer2/entry_codec.go
@@ -63,3 +63,25 @@ func PbToEntryAttribute(attr *filer_pb.FuseAttributes) Attr {
 
 	return t
 }
+
+func EqualEntry(a, b *Entry) bool {
+	if a == b {
+		return true
+	}
+	if a == nil && b != nil || a != nil && b == nil {
+		return false
+	}
+	if !proto.Equal(EntryAttributeToPb(a), EntryAttributeToPb(b)) {
+		return false
+	}
+	if len(a.Chunks) != len(b.Chunks) {
+		return false
+	}
+
+	for i := 0; i < len(a.Chunks); i++ {
+		if !proto.Equal(a.Chunks[i], b.Chunks[i]) {
+			return false
+		}
+	}
+	return true
+}
diff --git a/weed/filer2/filer.go b/weed/filer2/filer.go
index 823371a6b..475e79a17 100644
--- a/weed/filer2/filer.go
+++ b/weed/filer2/filer.go
@@ -90,6 +90,9 @@ func (f *Filer) CreateEntry(entry *Entry) error {
 			if mkdirErr != nil {
 				return fmt.Errorf("mkdir %s: %v", dirPath, mkdirErr)
 			}
+
+			f.NotifyUpdateEvent(nil, dirEntry)
+
 		} else if !dirEntry.IsDirectory() {
 			return fmt.Errorf("%s is a file", dirPath)
 		}
@@ -122,6 +125,8 @@ func (f *Filer) CreateEntry(entry *Entry) error {
 		return fmt.Errorf("insert entry %s: %v", entry.FullPath, err)
 	}
 
+	f.NotifyUpdateEvent(oldEntry, entry)
+
 	f.deleteChunksIfNotNew(oldEntry, entry)
 
 	return nil
@@ -170,6 +175,9 @@ func (f *Filer) DeleteEntryMetaAndData(p FullPath, isRecursive bool, shouldDelet
 		return nil
 	}
 	glog.V(0).Infof("deleting entry %v", p)
+
+	f.NotifyUpdateEvent(entry, nil)
+
 	return f.store.DeleteEntry(p)
 }
 
diff --git a/weed/filer2/filer_notify.go b/weed/filer2/filer_notify.go
new file mode 100644
index 000000000..2ce45db0e
--- /dev/null
+++ b/weed/filer2/filer_notify.go
@@ -0,0 +1,38 @@
+package filer2
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/msgqueue"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func (f *Filer) NotifyUpdateEvent(oldEntry, newEntry *Entry) {
+	var key string
+	if oldEntry != nil {
+		key = string(oldEntry.FullPath)
+	} else if newEntry != nil {
+		key = string(newEntry.FullPath)
+	} else {
+		return
+	}
+
+	msgqueue.Queue.SendMessage(
+		key,
+		&filer_pb.EventNotification{
+			OldEntry: toProtoEntry(oldEntry),
+			NewEntry: toProtoEntry(newEntry),
+		},
+	)
+
+}
+
+func toProtoEntry(entry *Entry) *filer_pb.Entry {
+	if entry == nil {
+		return nil
+	}
+	return &filer_pb.Entry{
+		Name:        string(entry.FullPath),
+		IsDirectory: entry.IsDirectory(),
+		Attributes:  EntryAttributeToPb(entry),
+		Chunks:      entry.Chunks,
+	}
+}
diff --git a/weed/msgqueue/configuration.go b/weed/msgqueue/configuration.go
new file mode 100644
index 000000000..63f103c1e
--- /dev/null
+++ b/weed/msgqueue/configuration.go
@@ -0,0 +1,82 @@
+package msgqueue
+
+import (
+	"os"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/spf13/viper"
+)
+
+const (
+	MSG_QUEUE_TOML_EXAMPLE = `
+# A sample TOML config file for SeaweedFS message queue
+
+[log]
+enabled = true
+
+[kafka]
+enabled = false
+hosts = [
+  "localhost:9092"
+]
+topic = "seaweedfs_filer"
+
+`
+)
+
+var (
+	MessageQueues []MessageQueue
+
+	Queue MessageQueue
+)
+
+func LoadConfiguration() {
+
+	// find a filer store
+	viper.SetConfigName("message_queue")    // name of config file (without extension)
+	viper.AddConfigPath(".")                // optionally look for config in the working directory
+	viper.AddConfigPath("$HOME/.seaweedfs") // call multiple times to add many search paths
+	viper.AddConfigPath("/etc/seaweedfs/")  // path to look for the config file in
+	if err := viper.ReadInConfig(); err != nil { // Handle errors reading the config file
+		glog.Fatalf("Failed to load message_queue.toml file from current directory, or $HOME/.seaweedfs/, "+
+			"or /etc/seaweedfs/"+
+			"\n\nPlease follow this example and add a message_queue.toml file to "+
+			"current directory, or $HOME/.seaweedfs/, or /etc/seaweedfs/:\n"+MSG_QUEUE_TOML_EXAMPLE, err)
+	}
+
+	glog.V(0).Infof("Reading message queue configuration from %s", viper.ConfigFileUsed())
+	for _, store := range MessageQueues {
+		if viper.GetBool(store.GetName() + ".enabled") {
+			viperSub := viper.Sub(store.GetName())
+			if err := store.Initialize(viperSub); err != nil {
+				glog.Fatalf("Failed to initialize store for %s: %+v",
+					store.GetName(), err)
+			}
+			Queue = store
+			glog.V(0).Infof("Configure message queue for %s from %s", store.GetName(), viper.ConfigFileUsed())
+			return
+		}
+	}
+
+	println()
+	println("Supported message queues are:")
+	for _, store := range MessageQueues {
+		println("    " + store.GetName())
+	}
+
+	println()
+	println("Please configure a supported message queue in", viper.ConfigFileUsed())
+	println()
+
+	os.Exit(-1)
+}
+
+// A simplified interface to decouple from Viper
+type Configuration interface {
+	GetString(key string) string
+	GetBool(key string) bool
+	GetInt(key string) int
+	GetInt64(key string) int64
+	GetFloat64(key string) float64
+	GetStringSlice(key string) []string
+}
diff --git a/weed/msgqueue/kafka/kafka_queue.go b/weed/msgqueue/kafka/kafka_queue.go
new file mode 100644
index 000000000..c013baf5f
--- /dev/null
+++ b/weed/msgqueue/kafka/kafka_queue.go
@@ -0,0 +1,76 @@
+package kafka
+
+import (
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/chrislusf/seaweedfs/weed/msgqueue"
+	"github.com/golang/protobuf/proto"
+	"github.com/Shopify/sarama"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+func init() {
+	msgqueue.MessageQueues = append(msgqueue.MessageQueues, &KafkaQueue{})
+}
+
+type KafkaQueue struct {
+	topic    string
+	producer sarama.AsyncProducer
+}
+
+func (k *KafkaQueue) GetName() string {
+	return "kafka"
+}
+
+func (k *KafkaQueue) Initialize(configuration msgqueue.Configuration) (err error) {
+	return k.initialize(
+		configuration.GetStringSlice("hosts"),
+		configuration.GetString("topic"),
+	)
+}
+
+func (k *KafkaQueue) initialize(hosts []string, topic string) (err error) {
+	config := sarama.NewConfig()
+	config.Producer.RequiredAcks = sarama.WaitForLocal
+	config.Producer.Partitioner = sarama.NewHashPartitioner
+	config.Producer.Return.Successes = true
+	config.Producer.Return.Errors = true
+	k.producer, err = sarama.NewAsyncProducer(hosts, config)
+	go k.handleSuccess()
+	go k.handleError()
+	return nil
+}
+
+func (k *KafkaQueue) SendMessage(key string, message proto.Message) (err error) {
+	bytes, err := proto.Marshal(message)
+	if err != nil {
+		return
+	}
+
+	msg := &sarama.ProducerMessage{
+		Topic: k.topic,
+		Key:   sarama.StringEncoder(key),
+		Value: sarama.ByteEncoder(bytes),
+	}
+
+	k.producer.Input() <- msg
+
+	return nil
+}
+
+func (k *KafkaQueue) handleSuccess() {
+	for {
+		pm := <-k.producer.Successes()
+		if pm != nil {
+			glog.Infof("producer message success, partition:%d offset:%d key:%v valus:%s", pm.Partition, pm.Offset, pm.Key, pm.Value)
+		}
+	}
+}
+
+func (k *KafkaQueue) handleError() {
+	for {
+		err := <-k.producer.Errors()
+		if err != nil {
+			glog.Errorf("producer message error, partition:%d offset:%d key:%v valus:%s error(%v)", err.Msg.Partition, err.Msg.Offset, err.Msg.Key, err.Msg.Value, err.Err)
+		}
+	}
+}
diff --git a/weed/msgqueue/log/log_queue.go b/weed/msgqueue/log/log_queue.go
new file mode 100644
index 000000000..ef7967e6c
--- /dev/null
+++ b/weed/msgqueue/log/log_queue.go
@@ -0,0 +1,29 @@
+package kafka
+
+import (
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/chrislusf/seaweedfs/weed/msgqueue"
+	"github.com/golang/protobuf/proto"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+func init() {
+	msgqueue.MessageQueues = append(msgqueue.MessageQueues, &LogQueue{})
+}
+
+type LogQueue struct {
+}
+
+func (k *LogQueue) GetName() string {
+	return "log"
+}
+
+func (k *LogQueue) Initialize(configuration msgqueue.Configuration) (err error) {
+	return nil
+}
+
+func (k *LogQueue) SendMessage(key string, message proto.Message) (err error) {
+
+	glog.V(0).Infof("%v: %+v", key, message)
+	return nil
+}
diff --git a/weed/msgqueue/message_queue.go b/weed/msgqueue/message_queue.go
new file mode 100644
index 000000000..6d57b9b3b
--- /dev/null
+++ b/weed/msgqueue/message_queue.go
@@ -0,0 +1,11 @@
+package msgqueue
+
+import "github.com/golang/protobuf/proto"
+
+type MessageQueue interface {
+	// GetName gets the name to locate the configuration in message_queue.toml file
+	GetName() string
+	// Initialize initializes the file store
+	Initialize(configuration Configuration) error
+	SendMessage(key string, message proto.Message) error
+}
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 1197d836e..b7e95d238 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -65,6 +65,11 @@ message Entry {
     FuseAttributes attributes = 4;
 }
 
+message EventNotification {
+    Entry old_entry = 2;
+    Entry new_entry = 3;
+}
+
 message FileChunk {
     string file_id = 1;
     int64 offset = 2;
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index d70917709..d3f14a7bf 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -14,6 +14,7 @@ It has these top-level messages:
 	ListEntriesRequest
 	ListEntriesResponse
 	Entry
+	EventNotification
 	FileChunk
 	FuseAttributes
 	GetEntryAttributesRequest
@@ -201,6 +202,38 @@ func (m *Entry) GetAttributes() *FuseAttributes {
 	return nil
 }
 
+type EventNotification struct {
+	Name     string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	OldEntry *Entry `protobuf:"bytes,2,opt,name=old_entry,json=oldEntry" json:"old_entry,omitempty"`
+	NewEntry *Entry `protobuf:"bytes,3,opt,name=new_entry,json=newEntry" json:"new_entry,omitempty"`
+}
+
+func (m *EventNotification) Reset()                    { *m = EventNotification{} }
+func (m *EventNotification) String() string            { return proto.CompactTextString(m) }
+func (*EventNotification) ProtoMessage()               {}
+func (*EventNotification) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
+
+func (m *EventNotification) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *EventNotification) GetOldEntry() *Entry {
+	if m != nil {
+		return m.OldEntry
+	}
+	return nil
+}
+
+func (m *EventNotification) GetNewEntry() *Entry {
+	if m != nil {
+		return m.NewEntry
+	}
+	return nil
+}
+
 type FileChunk struct {
 	FileId string `protobuf:"bytes,1,opt,name=file_id,json=fileId" json:"file_id,omitempty"`
 	Offset int64  `protobuf:"varint,2,opt,name=offset" json:"offset,omitempty"`
@@ -211,7 +244,7 @@ type FileChunk struct {
 func (m *FileChunk) Reset()                    { *m = FileChunk{} }
 func (m *FileChunk) String() string            { return proto.CompactTextString(m) }
 func (*FileChunk) ProtoMessage()               {}
-func (*FileChunk) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
+func (*FileChunk) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
 
 func (m *FileChunk) GetFileId() string {
 	if m != nil {
@@ -257,7 +290,7 @@ type FuseAttributes struct {
 func (m *FuseAttributes) Reset()                    { *m = FuseAttributes{} }
 func (m *FuseAttributes) String() string            { return proto.CompactTextString(m) }
 func (*FuseAttributes) ProtoMessage()               {}
-func (*FuseAttributes) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
+func (*FuseAttributes) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
 
 func (m *FuseAttributes) GetFileSize() uint64 {
 	if m != nil {
@@ -338,7 +371,7 @@ type GetEntryAttributesRequest struct {
 func (m *GetEntryAttributesRequest) Reset()                    { *m = GetEntryAttributesRequest{} }
 func (m *GetEntryAttributesRequest) String() string            { return proto.CompactTextString(m) }
 func (*GetEntryAttributesRequest) ProtoMessage()               {}
-func (*GetEntryAttributesRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
+func (*GetEntryAttributesRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
 
 func (m *GetEntryAttributesRequest) GetName() string {
 	if m != nil {
@@ -369,7 +402,7 @@ type GetEntryAttributesResponse struct {
 func (m *GetEntryAttributesResponse) Reset()                    { *m = GetEntryAttributesResponse{} }
 func (m *GetEntryAttributesResponse) String() string            { return proto.CompactTextString(m) }
 func (*GetEntryAttributesResponse) ProtoMessage()               {}
-func (*GetEntryAttributesResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
+func (*GetEntryAttributesResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{9} }
 
 func (m *GetEntryAttributesResponse) GetAttributes() *FuseAttributes {
 	if m != nil {
@@ -392,7 +425,7 @@ type GetFileContentRequest struct {
 func (m *GetFileContentRequest) Reset()                    { *m = GetFileContentRequest{} }
 func (m *GetFileContentRequest) String() string            { return proto.CompactTextString(m) }
 func (*GetFileContentRequest) ProtoMessage()               {}
-func (*GetFileContentRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{9} }
+func (*GetFileContentRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{10} }
 
 func (m *GetFileContentRequest) GetFileId() string {
 	if m != nil {
@@ -408,7 +441,7 @@ type GetFileContentResponse struct {
 func (m *GetFileContentResponse) Reset()                    { *m = GetFileContentResponse{} }
 func (m *GetFileContentResponse) String() string            { return proto.CompactTextString(m) }
 func (*GetFileContentResponse) ProtoMessage()               {}
-func (*GetFileContentResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{10} }
+func (*GetFileContentResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{11} }
 
 func (m *GetFileContentResponse) GetContent() []byte {
 	if m != nil {
@@ -425,7 +458,7 @@ type CreateEntryRequest struct {
 func (m *CreateEntryRequest) Reset()                    { *m = CreateEntryRequest{} }
 func (m *CreateEntryRequest) String() string            { return proto.CompactTextString(m) }
 func (*CreateEntryRequest) ProtoMessage()               {}
-func (*CreateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{11} }
+func (*CreateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{12} }
 
 func (m *CreateEntryRequest) GetDirectory() string {
 	if m != nil {
@@ -447,7 +480,7 @@ type CreateEntryResponse struct {
 func (m *CreateEntryResponse) Reset()                    { *m = CreateEntryResponse{} }
 func (m *CreateEntryResponse) String() string            { return proto.CompactTextString(m) }
 func (*CreateEntryResponse) ProtoMessage()               {}
-func (*CreateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{12} }
+func (*CreateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
 
 type UpdateEntryRequest struct {
 	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
@@ -457,7 +490,7 @@ type UpdateEntryRequest struct {
 func (m *UpdateEntryRequest) Reset()                    { *m = UpdateEntryRequest{} }
 func (m *UpdateEntryRequest) String() string            { return proto.CompactTextString(m) }
 func (*UpdateEntryRequest) ProtoMessage()               {}
-func (*UpdateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
+func (*UpdateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
 
 func (m *UpdateEntryRequest) GetDirectory() string {
 	if m != nil {
@@ -479,7 +512,7 @@ type UpdateEntryResponse struct {
 func (m *UpdateEntryResponse) Reset()                    { *m = UpdateEntryResponse{} }
 func (m *UpdateEntryResponse) String() string            { return proto.CompactTextString(m) }
 func (*UpdateEntryResponse) ProtoMessage()               {}
-func (*UpdateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+func (*UpdateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
 
 type DeleteEntryRequest struct {
 	Directory    string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
@@ -492,7 +525,7 @@ type DeleteEntryRequest struct {
 func (m *DeleteEntryRequest) Reset()                    { *m = DeleteEntryRequest{} }
 func (m *DeleteEntryRequest) String() string            { return proto.CompactTextString(m) }
 func (*DeleteEntryRequest) ProtoMessage()               {}
-func (*DeleteEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
+func (*DeleteEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
 
 func (m *DeleteEntryRequest) GetDirectory() string {
 	if m != nil {
@@ -535,7 +568,7 @@ type DeleteEntryResponse struct {
 func (m *DeleteEntryResponse) Reset()                    { *m = DeleteEntryResponse{} }
 func (m *DeleteEntryResponse) String() string            { return proto.CompactTextString(m) }
 func (*DeleteEntryResponse) ProtoMessage()               {}
-func (*DeleteEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
+func (*DeleteEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
 
 type AssignVolumeRequest struct {
 	Count       int32  `protobuf:"varint,1,opt,name=count" json:"count,omitempty"`
@@ -548,7 +581,7 @@ type AssignVolumeRequest struct {
 func (m *AssignVolumeRequest) Reset()                    { *m = AssignVolumeRequest{} }
 func (m *AssignVolumeRequest) String() string            { return proto.CompactTextString(m) }
 func (*AssignVolumeRequest) ProtoMessage()               {}
-func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
+func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
 
 func (m *AssignVolumeRequest) GetCount() int32 {
 	if m != nil {
@@ -595,7 +628,7 @@ type AssignVolumeResponse struct {
 func (m *AssignVolumeResponse) Reset()                    { *m = AssignVolumeResponse{} }
 func (m *AssignVolumeResponse) String() string            { return proto.CompactTextString(m) }
 func (*AssignVolumeResponse) ProtoMessage()               {}
-func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
+func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
 
 func (m *AssignVolumeResponse) GetFileId() string {
 	if m != nil {
@@ -632,7 +665,7 @@ type LookupVolumeRequest struct {
 func (m *LookupVolumeRequest) Reset()                    { *m = LookupVolumeRequest{} }
 func (m *LookupVolumeRequest) String() string            { return proto.CompactTextString(m) }
 func (*LookupVolumeRequest) ProtoMessage()               {}
-func (*LookupVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
+func (*LookupVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
 
 func (m *LookupVolumeRequest) GetVolumeIds() []string {
 	if m != nil {
@@ -648,7 +681,7 @@ type Locations struct {
 func (m *Locations) Reset()                    { *m = Locations{} }
 func (m *Locations) String() string            { return proto.CompactTextString(m) }
 func (*Locations) ProtoMessage()               {}
-func (*Locations) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
+func (*Locations) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
 
 func (m *Locations) GetLocations() []*Location {
 	if m != nil {
@@ -665,7 +698,7 @@ type Location struct {
 func (m *Location) Reset()                    { *m = Location{} }
 func (m *Location) String() string            { return proto.CompactTextString(m) }
 func (*Location) ProtoMessage()               {}
-func (*Location) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
+func (*Location) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{22} }
 
 func (m *Location) GetUrl() string {
 	if m != nil {
@@ -688,7 +721,7 @@ type LookupVolumeResponse struct {
 func (m *LookupVolumeResponse) Reset()                    { *m = LookupVolumeResponse{} }
 func (m *LookupVolumeResponse) String() string            { return proto.CompactTextString(m) }
 func (*LookupVolumeResponse) ProtoMessage()               {}
-func (*LookupVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{22} }
+func (*LookupVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{23} }
 
 func (m *LookupVolumeResponse) GetLocationsMap() map[string]*Locations {
 	if m != nil {
@@ -704,7 +737,7 @@ type DeleteCollectionRequest struct {
 func (m *DeleteCollectionRequest) Reset()                    { *m = DeleteCollectionRequest{} }
 func (m *DeleteCollectionRequest) String() string            { return proto.CompactTextString(m) }
 func (*DeleteCollectionRequest) ProtoMessage()               {}
-func (*DeleteCollectionRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{23} }
+func (*DeleteCollectionRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{24} }
 
 func (m *DeleteCollectionRequest) GetCollection() string {
 	if m != nil {
@@ -719,7 +752,7 @@ type DeleteCollectionResponse struct {
 func (m *DeleteCollectionResponse) Reset()                    { *m = DeleteCollectionResponse{} }
 func (m *DeleteCollectionResponse) String() string            { return proto.CompactTextString(m) }
 func (*DeleteCollectionResponse) ProtoMessage()               {}
-func (*DeleteCollectionResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{24} }
+func (*DeleteCollectionResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{25} }
 
 func init() {
 	proto.RegisterType((*LookupDirectoryEntryRequest)(nil), "filer_pb.LookupDirectoryEntryRequest")
@@ -727,6 +760,7 @@ func init() {
 	proto.RegisterType((*ListEntriesRequest)(nil), "filer_pb.ListEntriesRequest")
 	proto.RegisterType((*ListEntriesResponse)(nil), "filer_pb.ListEntriesResponse")
 	proto.RegisterType((*Entry)(nil), "filer_pb.Entry")
+	proto.RegisterType((*EventNotification)(nil), "filer_pb.EventNotification")
 	proto.RegisterType((*FileChunk)(nil), "filer_pb.FileChunk")
 	proto.RegisterType((*FuseAttributes)(nil), "filer_pb.FuseAttributes")
 	proto.RegisterType((*GetEntryAttributesRequest)(nil), "filer_pb.GetEntryAttributesRequest")
@@ -1088,75 +1122,78 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
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+	0xee, 0x14, 0x14, 0xb9, 0x07, 0x2b, 0xd2, 0x70, 0xc8, 0x22, 0x13, 0xbf, 0x2d, 0xb7, 0x2f, 0x23,
+	0xd9, 0x21, 0xe9, 0x68, 0xc4, 0x51, 0xa8, 0xf0, 0x4d, 0xdf, 0xec, 0x64, 0xb6, 0x9c, 0xfd, 0xa6,
+	0x9b, 0x62, 0xd9, 0x57, 0x6b, 0x79, 0xaf, 0x63, 0xc1, 0xc6, 0xa8, 0x8a, 0xd1, 0xf4, 0xf5, 0x86,
+	0xfe, 0xd1, 0x80, 0x5b, 0xe5, 0x62, 0x90, 0xfb, 0xe0, 0xaa, 0x68, 0xca, 0x83, 0xa3, 0x3c, 0xa8,
+	0x01, 0x3b, 0x29, 0x79, 0x69, 0x58, 0x5e, 0xa6, 0x47, 0xc6, 0x69, 0xa4, 0x83, 0xae, 0xe9, 0x23,
+	0xaf, 0xd2, 0x08, 0xc9, 0x6d, 0x68, 0xe6, 0x2c, 0x52, 0x61, 0xd7, 0x7c, 0xb9, 0x94, 0x92, 0x73,
+	0x16, 0x99, 0x06, 0x93, 0x4b, 0x09, 0x24, 0xcc, 0x94, 0xdf, 0xb6, 0x06, 0xa2, 0x77, 0x12, 0xc8,
+	0x58, 0x4a, 0x57, 0x74, 0xd9, 0xe5, 0x9a, 0x0c, 0xa0, 0x93, 0xe1, 0x24, 0x36, 0x37, 0xe3, 0xad,
+	0x2a, 0x95, 0x2d, 0x22, 0x0f, 0x00, 0xc2, 0x34, 0x8e, 0x31, 0x54, 0x06, 0xae, 0x32, 0xb0, 0x24,
+	0xb2, 0x9e, 0x42, 0xc4, 0x43, 0x8e, 0xa1, 0x07, 0x03, 0x67, 0xbb, 0xe5, 0xb7, 0x85, 0x88, 0x4f,
+	0x30, 0xa4, 0xe7, 0xf0, 0xf1, 0x0b, 0x54, 0x4d, 0x7e, 0x6d, 0x75, 0x87, 0x19, 0xd6, 0xba, 0x16,
+	0xd8, 0x02, 0x98, 0x04, 0x19, 0x26, 0x42, 0xb6, 0xae, 0x19, 0x53, 0x57, 0x4b, 0x0e, 0x59, 0x66,
+	0x5f, 0x5c, 0xd3, 0xbe, 0x38, 0xd9, 0x64, 0xfd, 0xba, 0x48, 0x66, 0xac, 0xca, 0xdd, 0xeb, 0xbc,
+	0x7b, 0xf7, 0x5a, 0x43, 0xd2, 0x78, 0xeb, 0x90, 0xd0, 0x3d, 0xb8, 0xf3, 0x02, 0x85, 0x92, 0xa7,
+	0x89, 0xc0, 0x44, 0x14, 0x50, 0x17, 0x35, 0x1c, 0xdd, 0x87, 0xbb, 0xf3, 0x27, 0x4c, 0xca, 0x1e,
+	0xac, 0x84, 0x5a, 0xa4, 0x8e, 0x74, 0xfd, 0x62, 0x4b, 0x7f, 0x04, 0x72, 0x90, 0x61, 0x20, 0xf0,
+	0x3d, 0xa8, 0x78, 0x4a, 0xab, 0x8d, 0x1b, 0x69, 0xf5, 0x0e, 0xf4, 0x4a, 0xae, 0x75, 0x2e, 0x32,
+	0xe2, 0xe9, 0x24, 0xfa, 0x50, 0x11, 0x4b, 0xae, 0x4d, 0xc4, 0x7f, 0x1c, 0x20, 0x87, 0x18, 0xe3,
+	0x7b, 0x85, 0xac, 0xf9, 0xde, 0x54, 0x78, 0xb0, 0x59, 0xe5, 0xc1, 0x47, 0x70, 0x4b, 0x9a, 0xa8,
+	0x68, 0xc3, 0x28, 0x10, 0x81, 0x21, 0xf3, 0x2e, 0xe3, 0x3a, 0x85, 0xc3, 0x40, 0x04, 0xc6, 0x51,
+	0x86, 0x61, 0x9e, 0x49, 0x7e, 0x57, 0xc3, 0xa6, 0x1c, 0xf9, 0x85, 0x48, 0x62, 0x29, 0xe5, 0x6c,
+	0xb0, 0xfc, 0xed, 0x40, 0xef, 0x19, 0xe7, 0xec, 0x3c, 0xf9, 0x21, 0x8d, 0xf3, 0x31, 0x16, 0x60,
+	0x36, 0xa0, 0x15, 0xa6, 0xb9, 0xb9, 0xdf, 0x96, 0xaf, 0x37, 0x73, 0xb3, 0xd6, 0xa8, 0xcc, 0xda,
+	0xdc, 0xb4, 0x36, 0xab, 0xd3, 0x6a, 0x4d, 0xe3, 0xb2, 0x3d, 0x8d, 0xe4, 0x13, 0xe8, 0x48, 0x78,
+	0xc3, 0x10, 0x13, 0x81, 0x99, 0x42, 0xe0, 0xfa, 0x20, 0x45, 0x07, 0x4a, 0x42, 0x2f, 0x61, 0xa3,
+	0x9c, 0xa8, 0xe9, 0xc5, 0x85, 0x7c, 0x29, 0xa9, 0x28, 0x8b, 0x4d, 0x96, 0x72, 0xa9, 0x06, 0x38,
+	0x3f, 0x8b, 0x59, 0x38, 0x94, 0x8a, 0xa6, 0x19, 0x60, 0x25, 0x39, 0xcd, 0xe2, 0x19, 0xe6, 0x65,
+	0x0b, 0x33, 0xfd, 0x12, 0x7a, 0xfa, 0x51, 0x50, 0x2e, 0xd0, 0x16, 0xc0, 0xa5, 0x12, 0x0c, 0x59,
+	0xa4, 0xbf, 0x87, 0xae, 0xef, 0x6a, 0xc9, 0xcb, 0x88, 0xd3, 0x6f, 0xc1, 0x3d, 0x4e, 0x35, 0x66,
+	0x4e, 0xf6, 0xc0, 0x8d, 0x8b, 0x8d, 0xf9, 0x74, 0x92, 0x59, 0xcb, 0x15, 0x76, 0xfe, 0xcc, 0x88,
+	0x7e, 0x03, 0xab, 0x85, 0xb8, 0xc0, 0xe1, 0x2c, 0xc2, 0xd1, 0x98, 0xc3, 0x41, 0xff, 0x73, 0x60,
+	0xa3, 0x9c, 0xb2, 0x29, 0xd5, 0x29, 0xac, 0x4d, 0x43, 0x0c, 0xc7, 0xc1, 0xc4, 0xe4, 0xb2, 0x67,
+	0xe7, 0x52, 0x3d, 0x36, 0x4d, 0x90, 0xbf, 0x0a, 0x26, 0xba, 0x7b, 0xba, 0xb1, 0x25, 0xea, 0x7f,
+	0x0f, 0xeb, 0x15, 0x13, 0x99, 0xf5, 0x05, 0x16, 0x73, 0x20, 0x97, 0xe4, 0x09, 0xb4, 0x2e, 0x83,
+	0x38, 0x47, 0x33, 0x74, 0xbd, 0x6a, 0x05, 0xb8, 0xaf, 0x2d, 0xbe, 0x6e, 0x3c, 0x75, 0xe8, 0x57,
+	0x70, 0x4f, 0x37, 0xec, 0xc1, 0xb4, 0xbf, 0x8a, 0xda, 0x97, 0xdb, 0xd0, 0x99, 0x6f, 0x43, 0xda,
+	0x07, 0xaf, 0x7a, 0x54, 0x83, 0xd9, 0xff, 0xb3, 0x0d, 0xdd, 0x13, 0x0c, 0xae, 0x10, 0x23, 0xc9,
+	0x6c, 0x19, 0x39, 0x2f, 0x8a, 0x55, 0x7e, 0xf4, 0x91, 0xc7, 0xf3, 0x55, 0xa9, 0x7d, 0x65, 0xf6,
+	0x3f, 0x7b, 0x9b, 0x99, 0x19, 0xb4, 0x25, 0x72, 0x0c, 0x1d, 0xeb, 0x55, 0x45, 0x36, 0xad, 0x83,
+	0x95, 0xc7, 0x62, 0x7f, 0x6b, 0x81, 0x76, 0xea, 0x2d, 0x00, 0x52, 0xfd, 0xa6, 0x90, 0x4f, 0x67,
+	0xc7, 0x16, 0x7e, 0xdb, 0xfa, 0x8f, 0x6e, 0x36, 0xb2, 0x13, 0xb6, 0x08, 0xd7, 0x4e, 0xb8, 0x4a,
+	0xf1, 0x76, 0xc2, 0x75, 0x2c, 0xad, 0xbc, 0x59, 0x64, 0x6a, 0x7b, 0xab, 0xd2, 0xb7, 0xed, 0xad,
+	0x8e, 0x81, 0x95, 0x37, 0x8b, 0xce, 0x6c, 0x6f, 0x55, 0x66, 0xb6, 0xbd, 0xd5, 0x71, 0xe0, 0x12,
+	0x79, 0x03, 0x5d, 0x9b, 0x5b, 0x88, 0x75, 0xa0, 0x86, 0x1c, 0xfb, 0x0f, 0x16, 0xa9, 0x6d, 0x87,
+	0xf6, 0x28, 0xd9, 0x0e, 0x6b, 0xc8, 0xc4, 0x76, 0x58, 0x37, 0x81, 0x74, 0x89, 0xfc, 0x04, 0xb7,
+	0xe7, 0x5b, 0x9a, 0x3c, 0x9c, 0x87, 0x55, 0x99, 0x94, 0x3e, 0xbd, 0xc9, 0xa4, 0x70, 0x7e, 0xd6,
+	0x56, 0x7f, 0x56, 0x5f, 0xfc, 0x1f, 0x00, 0x00, 0xff, 0xff, 0x41, 0x0a, 0x10, 0x9d, 0x68, 0x0d,
+	0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 0f84cf527..98e8699b0 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -173,6 +173,10 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 
 	}
 
+	if filer2.EqualEntry(entry, newEntry) {
+		return &filer_pb.UpdateEntryResponse{}, err
+	}
+
 	if err = fs.filer.UpdateEntry(newEntry); err == nil {
 		for _, garbage := range unusedChunks {
 			glog.V(0).Infof("deleting %s old chunk: %v, [%d, %d)", fullpath, garbage.FileId, garbage.Offset, garbage.Offset+int64(garbage.Size))
@@ -184,6 +188,8 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 		}
 	}
 
+	fs.filer.NotifyUpdateEvent(entry, newEntry)
+
 	return &filer_pb.UpdateEntryResponse{}, err
 }
 
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 61ca972cc..c9dabe5cb 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -8,9 +8,12 @@ import (
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/mysql"
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/postgres"
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/redis"
+	_ "github.com/chrislusf/seaweedfs/weed/msgqueue/kafka"
+	_ "github.com/chrislusf/seaweedfs/weed/msgqueue/log"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"net/http"
+	"github.com/chrislusf/seaweedfs/weed/msgqueue"
 )
 
 type FilerOption struct {
@@ -23,6 +26,7 @@ type FilerOption struct {
 	SecretKey          string
 	DirListingLimit    int
 	DataCenter         string
+	EnableNotification bool
 }
 
 type FilerServer struct {
@@ -46,6 +50,10 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 
 	fs.filer.LoadConfiguration()
 
+	if fs.option.EnableNotification {
+		msgqueue.LoadConfiguration()
+	}
+
 	defaultMux.HandleFunc("/favicon.ico", faviconHandler)
 	defaultMux.HandleFunc("/", fs.filerHandler)
 	if defaultMux != readonlyMux {