diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index d9c250127..0c4d610c5 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -53,6 +53,7 @@ func NewFiler(masters []string, grpcDialOption grpc.DialOption,
 	f.LocalMetaLogBuffer = log_buffer.NewLogBuffer(LogFlushInterval, f.logFlushFunc, notifyFn)
 	f.metaLogCollection = collection
 	f.metaLogReplication = replication
+
 	go f.loopProcessingDeletion()
 
 	return f
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 3d54ea2c9..5133c1fea 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: filer.proto
 
 package filer_pb
diff --git a/weed/pb/iam_pb/iam.pb.go b/weed/pb/iam_pb/iam.pb.go
index 93bc854cc..6c1cc0e45 100644
--- a/weed/pb/iam_pb/iam.pb.go
+++ b/weed/pb/iam_pb/iam.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: iam.proto
 
 package iam_pb
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 96c3c75cc..6803a30cf 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -130,6 +130,7 @@ message VolumeLocation {
     repeated uint32 new_vids = 3;
     repeated uint32 deleted_vids = 4;
     string leader = 5; // optional when leader is not itself
+    string data_center = 6; // optional when DataCenter is in use
 }
 
 message LookupVolumeRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index e96af6abe..8d4d4d4e7 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: master.proto
 
 package master_pb
@@ -783,8 +783,8 @@ type VolumeLocation struct {
 	PublicUrl   string   `protobuf:"bytes,2,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
 	NewVids     []uint32 `protobuf:"varint,3,rep,packed,name=new_vids,json=newVids,proto3" json:"new_vids,omitempty"`
 	DeletedVids []uint32 `protobuf:"varint,4,rep,packed,name=deleted_vids,json=deletedVids,proto3" json:"deleted_vids,omitempty"`
-	Leader      string   `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`          // optional when leader is not itself
-	DataCenter  string   `protobuf:"bytes,6,opt,name=data_center,proto3" json:"dataCenter,omitempty"` // optional when DataCenter is in use
+	Leader      string   `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`                           // optional when leader is not itself
+	DataCenter  string   `protobuf:"bytes,6,opt,name=data_center,json=dataCenter,proto3" json:"data_center,omitempty"` // optional when DataCenter is in use
 }
 
 func (x *VolumeLocation) Reset() {
@@ -854,6 +854,13 @@ func (x *VolumeLocation) GetLeader() string {
 	return ""
 }
 
+func (x *VolumeLocation) GetDataCenter() string {
+	if x != nil {
+		return x.DataCenter
+	}
+	return ""
+}
+
 type LookupVolumeRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2993,7 +3000,7 @@ var file_master_proto_rawDesc = []byte{
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@@ -3003,343 +3010,345 @@ var file_master_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/weed/pb/messaging_pb/messaging.pb.go b/weed/pb/messaging_pb/messaging.pb.go
index 90b4b724a..bd87a4780 100644
--- a/weed/pb/messaging_pb/messaging.pb.go
+++ b/weed/pb/messaging_pb/messaging.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: messaging.proto
 
 package messaging_pb
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index ee33b8263..6ffbf3d29 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.24.0
-// 	protoc        v3.12.3
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
 // source: volume_server.proto
 
 package volume_server_pb
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 0a69a70e1..9df88e956 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -29,9 +29,8 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			glog.V(0).Infof("unregister disconnected volume server %s:%d", dn.Ip, dn.Port)
 
 			message := &master_pb.VolumeLocation{
-				Url:        dn.Url(),
-				PublicUrl:  dn.PublicUrl,
-				DataCenter: dn.GetDataCenter().String(),
+				Url:       dn.Url(),
+				PublicUrl: dn.PublicUrl,
 			}
 			for _, v := range dn.GetVolumes() {
 				message.DeletedVids = append(message.DeletedVids, uint32(v.Id))
@@ -89,7 +88,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 		message := &master_pb.VolumeLocation{
 			Url:        dn.Url(),
 			PublicUrl:  dn.PublicUrl,
-			DataCenter: dn.GetDataCenter().String(),
+			DataCenter: string(dn.GetDataCenter().Id()),
 		}
 		if len(heartbeat.NewVolumes) > 0 || len(heartbeat.DeletedVolumes) > 0 {
 			// process delta volume ids if exists for fast volume id updates
@@ -150,7 +149,6 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			}
 
 		}
-
 		if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 {
 			ms.clientChansLock.RLock()
 			for host, ch := range ms.clientChans {
diff --git a/weed/topology/topology_map.go b/weed/topology/topology_map.go
index f25858848..73c55d77d 100644
--- a/weed/topology/topology_map.go
+++ b/weed/topology/topology_map.go
@@ -62,9 +62,8 @@ func (t *Topology) ToVolumeLocations() (volumeLocations []*master_pb.VolumeLocat
 			for _, d := range rack.Children() {
 				dn := d.(*DataNode)
 				volumeLocation := &master_pb.VolumeLocation{
-					Url:        dn.Url(),
-					PublicUrl:  dn.PublicUrl,
-					DataCenter: dn.GetDataCenter().String(),
+					Url:       dn.Url(),
+					PublicUrl: dn.PublicUrl,
 				}
 				for _, v := range dn.GetVolumes() {
 					volumeLocation.NewVids = append(volumeLocation.NewVids, uint32(v.Id))
diff --git a/weed/wdclient/vid_map.go b/weed/wdclient/vid_map.go
index 09b9eb71c..773da0191 100644
--- a/weed/wdclient/vid_map.go
+++ b/weed/wdclient/vid_map.go
@@ -98,6 +98,7 @@ func (vc *vidMap) GetVidLocations(vid string) (locations []Location, err error)
 func (vc *vidMap) GetLocations(vid uint32) (locations []Location, found bool) {
 	vc.RLock()
 	defer vc.RUnlock()
+
 	locations, found = vc.vid2Locations[vid]
 	return
 }