diff --git a/weed/command/filer_replication.go b/weed/command/filer_replication.go
index 18f549edc..25bca7c97 100644
--- a/weed/command/filer_replication.go
+++ b/weed/command/filer_replication.go
@@ -44,7 +44,7 @@ func runFilerReplicate(cmd *Command, args []string) bool {
 		}
 	}
 
-	replicator := replication.NewReplicator(config.Sub("sink.filer"))
+	replicator := replication.NewReplicator(config.Sub("source.filer"), config.Sub("sink.filer"))
 
 	for {
 		key, m, err := notificationInput.ReceiveMessage()
diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index 17d8b1884..aa4be5ea9 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -149,25 +149,19 @@ topic = "seaweedfs_filer"
 [source.filer]
 enabled = true
 grpcAddress = "localhost:18888"
-# id is to identify the notification source, avoid reprocessing the same events
-id = "filer1"
-# all files under this directory tree and not from this source.filer.id is replicated
-directory = "/"
+directory = "/buckets"    # all files under this directory tree are replicated
 
 [notification.kafka]
 enabled = true
 hosts = [
   "localhost:9092"
 ]
-topic = "seaweedfs_filer"
+topic = "seaweedfs_filer1_to_filer2"
 
 [sink.filer]
 enabled = true
 grpcAddress = "localhost:18888"
-# id is to identify the notification source, avoid reprocessing the same events
-id = "filer2"
-# all files under this directory tree and not from this source.filer.id is replicated
-directory = "/"
+directory = "/backup"    # all replicated files are under this directory tree
 
 `
 )
diff --git a/weed/replication/replicator.go b/weed/replication/replicator.go
index c223021c2..4f5d5203e 100644
--- a/weed/replication/replicator.go
+++ b/weed/replication/replicator.go
@@ -4,28 +4,48 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/replication/sink"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/replication/source"
+	"strings"
+	"github.com/chrislusf/seaweedfs/weed/glog"
 )
 
 type Replicator struct {
-	sink *sink.FilerSink
+	sink   sink.ReplicationSink
+	source *source.FilerSource
 }
 
-func NewReplicator(config util.Configuration) *Replicator {
+func NewReplicator(sourceConfig, sinkConfig util.Configuration) *Replicator {
 
 	sink := &sink.FilerSink{}
-	sink.Initialize(config)
+	sink.Initialize(sinkConfig)
+
+	source := &source.FilerSource{}
+	source.Initialize(sourceConfig)
+
+	if sourceConfig.GetString("grpcAddress") == sinkConfig.GetString("grpcAddress") {
+		fromDir := sourceConfig.GetString("directory")
+		toDir := sinkConfig.GetString("directory")
+		if strings.HasPrefix(toDir, fromDir) {
+			glog.Fatalf("recursive replication! source directory %s includes the sink directory %s", fromDir, toDir)
+		}
+	}
 
 	return &Replicator{
-		sink: sink,
+		sink:   sink,
+		source: source,
 	}
 }
 
 func (r *Replicator) Replicate(key string, message *filer_pb.EventNotification) error {
+	if !strings.HasPrefix(key, r.source.Dir) {
+		return nil
+	}
+	key = r.sink.GetDirectory() + key[len(r.source.Dir):]
 	if message.OldEntry != nil && message.NewEntry == nil {
-		return r.sink.DeleteEntry(message.OldEntry, message.DeleteChunks)
+		return r.sink.DeleteEntry(key, message.OldEntry, message.DeleteChunks)
 	}
 	if message.OldEntry == nil && message.NewEntry != nil {
-		return r.sink.CreateEntry(message.NewEntry)
+		return r.sink.CreateEntry(key, message.NewEntry)
 	}
-	return r.sink.UpdateEntry(message.OldEntry, message.NewEntry, message.DeleteChunks)
+	return r.sink.UpdateEntry(key, message.OldEntry, message.NewEntry, message.DeleteChunks)
 }
diff --git a/weed/replication/sink/filer_sink.go b/weed/replication/sink/filer_sink.go
index 57ebeddff..387bffb58 100644
--- a/weed/replication/sink/filer_sink.go
+++ b/weed/replication/sink/filer_sink.go
@@ -12,36 +12,38 @@ import (
 )
 
 type ReplicationSink interface {
-	DeleteEntry(entry *filer_pb.Entry, deleteIncludeChunks bool) error
-	CreateEntry(entry *filer_pb.Entry) error
-	UpdateEntry(oldEntry, newEntry *filer_pb.Entry, deleteIncludeChunks bool) error
+	DeleteEntry(key string, entry *filer_pb.Entry, deleteIncludeChunks bool) error
+	CreateEntry(key string, entry *filer_pb.Entry) error
+	UpdateEntry(key string, oldEntry, newEntry *filer_pb.Entry, deleteIncludeChunks bool) error
+	GetDirectory() string
 }
 
 type FilerSink struct {
 	grpcAddress string
-	id          string
 	dir         string
 }
 
+func (fs *FilerSink) GetDirectory() string {
+	return fs.dir
+}
+
 func (fs *FilerSink) Initialize(configuration util.Configuration) error {
 	return fs.initialize(
 		configuration.GetString("grpcAddress"),
-		configuration.GetString("id"),
 		configuration.GetString("directory"),
 	)
 }
 
-func (fs *FilerSink) initialize(grpcAddress string, id string, dir string) (err error) {
+func (fs *FilerSink) initialize(grpcAddress string, dir string) (err error) {
 	fs.grpcAddress = grpcAddress
-	fs.id = id
 	fs.dir = dir
 	return nil
 }
 
-func (fs *FilerSink) DeleteEntry(entry *filer_pb.Entry, deleteIncludeChunks bool) error {
+func (fs *FilerSink) DeleteEntry(key string, entry *filer_pb.Entry, deleteIncludeChunks bool) error {
 	return fs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
-		dir, name := filer2.FullPath(entry.Name).DirAndName()
+		dir, name := filer2.FullPath(key).DirAndName()
 
 		request := &filer_pb.DeleteEntryRequest{
 			Directory:    dir,
@@ -53,26 +55,26 @@ func (fs *FilerSink) DeleteEntry(entry *filer_pb.Entry, deleteIncludeChunks bool
 		glog.V(1).Infof("delete entry: %v", request)
 		_, err := client.DeleteEntry(context.Background(), request)
 		if err != nil {
-			glog.V(0).Infof("delete entry %s: %v", entry.Name, err)
-			return fmt.Errorf("delete entry %s: %v", entry.Name, err)
+			glog.V(0).Infof("delete entry %s: %v", key, err)
+			return fmt.Errorf("delete entry %s: %v", key, err)
 		}
 
 		return nil
 	})
 }
 
-func (fs *FilerSink) CreateEntry(entry *filer_pb.Entry) error {
+func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 
 	replicatedChunks, err := replicateChunks(entry.Chunks)
 
 	if err != nil {
-		glog.V(0).Infof("replicate entry chunks %s: %v", entry.Name, err)
-		return fmt.Errorf("replicate entry chunks %s: %v", entry.Name, err)
+		glog.V(0).Infof("replicate entry chunks %s: %v", key, err)
+		return fmt.Errorf("replicate entry chunks %s: %v", key, err)
 	}
 
 	return fs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
-		dir, name := filer2.FullPath(entry.Name).DirAndName()
+		dir, name := filer2.FullPath(key).DirAndName()
 
 		request := &filer_pb.CreateEntryRequest{
 			Directory: dir,
@@ -86,15 +88,15 @@ func (fs *FilerSink) CreateEntry(entry *filer_pb.Entry) error {
 
 		glog.V(1).Infof("create: %v", request)
 		if _, err := client.CreateEntry(context.Background(), request); err != nil {
-			glog.V(0).Infof("create entry %s: %v", entry.Name, err)
-			return fmt.Errorf("create entry %s: %v", entry.Name, err)
+			glog.V(0).Infof("create entry %s: %v", key, err)
+			return fmt.Errorf("create entry %s: %v", key, err)
 		}
 
 		return nil
 	})
 }
 
-func (fs *FilerSink) UpdateEntry(oldEntry, newEntry *filer_pb.Entry, deleteIncludeChunks bool) error {
+func (fs *FilerSink) UpdateEntry(key string, oldEntry, newEntry *filer_pb.Entry, deleteIncludeChunks bool) error {
 	return nil
 }
 
diff --git a/weed/replication/source/filer_source.go b/weed/replication/source/filer_source.go
index 49c623815..c3b575b6d 100644
--- a/weed/replication/source/filer_source.go
+++ b/weed/replication/source/filer_source.go
@@ -16,22 +16,19 @@ type ReplicationSource interface {
 
 type FilerSource struct {
 	grpcAddress string
-	id          string
-	dir         string
+	Dir         string
 }
 
 func (fs *FilerSource) Initialize(configuration util.Configuration) error {
 	return fs.initialize(
 		configuration.GetString("grpcAddress"),
-		configuration.GetString("id"),
 		configuration.GetString("directory"),
 	)
 }
 
-func (fs *FilerSource) initialize(grpcAddress string, id string, dir string) (err error) {
+func (fs *FilerSource) initialize(grpcAddress string, dir string) (err error) {
 	fs.grpcAddress = grpcAddress
-	fs.id = id
-	fs.dir = dir
+	fs.Dir = dir
 	return nil
 }