diff --git a/weed/filer2/filer.go b/weed/filer2/filer.go
index 06c997f36..7747c9af6 100644
--- a/weed/filer2/filer.go
+++ b/weed/filer2/filer.go
@@ -38,9 +38,11 @@ type Filer struct {
 	LocalMetaLogBuffer  *log_buffer.LogBuffer
 	metaLogCollection   string
 	metaLogReplication  string
+	MetaAggregator      *MetaAggregator
 }
 
-func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerHost string, filerGrpcPort uint32, collection string, replication string, notifyFn func()) *Filer {
+func NewFiler(masters []string, grpcDialOption grpc.DialOption,
+	filerHost string, filerGrpcPort uint32, collection string, replication string, notifyFn func()) *Filer {
 	f := &Filer{
 		directoryCache:      ccache.New(ccache.Configure().MaxSize(1000).ItemsToPrune(100)),
 		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, filerGrpcPort, masters),
@@ -56,6 +58,20 @@ func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerHost string
 	return f
 }
 
+func (f *Filer) AggregateFromPeers(self string, filers []string) {
+
+	// set peers
+	if strings.HasPrefix(f.GetStore().GetName(), "leveldb") && len(filers) > 0 {
+		glog.Fatalf("filers using separate leveldb stores should not configure %d peers %+v", len(filers), filers)
+	}
+	if len(filers) == 0 {
+		filers = append(filers, self)
+	}
+	f.MetaAggregator = NewMetaAggregator(filers, f.GrpcDialOption)
+	f.MetaAggregator.StartLoopSubscribe(time.Now().UnixNano())
+
+}
+
 func (f *Filer) SetStore(store FilerStore) {
 	f.store = NewFilerStoreWrapper(store)
 }
diff --git a/weed/server/filer_grpc_server_sub_meta.go b/weed/server/filer_grpc_server_sub_meta.go
index 8ef75cf02..4fd38abe5 100644
--- a/weed/server/filer_grpc_server_sub_meta.go
+++ b/weed/server/filer_grpc_server_sub_meta.go
@@ -37,10 +37,10 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 		lastReadTime = time.Unix(0, processedTsNs)
 	}
 
-	err = fs.metaAggregator.MetaLogBuffer.LoopProcessLogData(lastReadTime, func() bool {
-		fs.metaAggregator.ListenersLock.Lock()
-		fs.metaAggregator.ListenersCond.Wait()
-		fs.metaAggregator.ListenersLock.Unlock()
+	err = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData(lastReadTime, func() bool {
+		fs.filer.MetaAggregator.ListenersLock.Lock()
+		fs.filer.MetaAggregator.ListenersCond.Wait()
+		fs.filer.MetaAggregator.ListenersLock.Unlock()
 		return true
 	}, eachLogEntryFn)
 
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index c6ab6ef0f..6995c7cfe 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"net/http"
 	"os"
-	"strings"
 	"sync"
 	"time"
 
@@ -60,7 +59,6 @@ type FilerServer struct {
 	option         *FilerOption
 	secret         security.SigningKey
 	filer          *filer2.Filer
-	metaAggregator *filer2.MetaAggregator
 	grpcDialOption grpc.DialOption
 
 	// notifying clients
@@ -121,15 +119,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		readonlyMux.HandleFunc("/", fs.readonlyFilerHandler)
 	}
 
-	// set peers
-	if strings.HasPrefix(fs.filer.GetStore().GetName(), "leveldb") && len(option.Filers) > 0 {
-		glog.Fatalf("filers using separate leveldb stores should not configure %d peers %+v", len(option.Filers), option.Filers)
-	}
-	if len(option.Filers) == 0 {
-		option.Filers = append(option.Filers, fmt.Sprintf("%s:%d", option.Host, option.Port))
-	}
-	fs.metaAggregator = filer2.NewMetaAggregator(option.Filers, fs.grpcDialOption)
-	fs.metaAggregator.StartLoopSubscribe(time.Now().UnixNano())
+	fs.filer.AggregateFromPeers(fmt.Sprintf("%s:%d", option.Host, option.Port), option.Filers)
 
 	fs.filer.LoadBuckets()