diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 74d347142e6..35bfdefedfc 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -126,6 +126,10 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 
 		ms.Topo.Sequence.SetMax(heartbeat.MaxFileKey)
 		if dn == nil {
+			// skip deltaBeat
+			if heartbeat.HasNoVolumes {
+				continue
+			}
 			dcName, rackName := ms.Topo.Configuration.Locate(heartbeat.Ip, heartbeat.DataCenter, heartbeat.Rack)
 			dc := ms.Topo.GetOrCreateDataCenter(dcName)
 			rack := dc.GetOrCreateRack(rackName)
diff --git a/weed/topology/configuration.go b/weed/topology/configuration.go
index cb635658f0e..d9fde4a047d 100644
--- a/weed/topology/configuration.go
+++ b/weed/topology/configuration.go
@@ -20,9 +20,8 @@ type topology struct {
 	DataCenters []dataCenter `xml:"DataCenter"`
 }
 type Configuration struct {
-	XMLName     xml.Name       `xml:"Configuration"`
-	Topo        topology       `xml:"Topology"`
-	ip2location map[string]loc // this is not used any more. leave it here for later.
+	XMLName xml.Name `xml:"Configuration"`
+	Topo    topology `xml:"Topology"`
 }
 
 func (c *Configuration) String() string {
@@ -33,12 +32,6 @@ func (c *Configuration) String() string {
 }
 
 func (c *Configuration) Locate(ip string, dcName string, rackName string) (dc string, rack string) {
-	if c != nil && c.ip2location != nil {
-		if loc, ok := c.ip2location[ip]; ok {
-			return loc.dcName, loc.rackName
-		}
-	}
-
 	if dcName == "" {
 		dcName = "DefaultDataCenter"
 	}
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 41c5a8bc45b..d3bdf202f92 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -262,12 +262,17 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 }
 
 func (mc *MasterClient) updateVidMap(resp *master_pb.KeepConnectedResponse) {
+	volLocGrpcPort := int(resp.VolumeLocation.GrpcPort)
+	if resp.VolumeLocation.Url == "" || volLocGrpcPort == 0 {
+		glog.V(0).Infof("updateVidMap ignore short heartbeat: %+v", resp)
+		return
+	}
 	// process new volume location
 	loc := Location{
 		Url:        resp.VolumeLocation.Url,
 		PublicUrl:  resp.VolumeLocation.PublicUrl,
 		DataCenter: resp.VolumeLocation.DataCenter,
-		GrpcPort:   int(resp.VolumeLocation.GrpcPort),
+		GrpcPort:   volLocGrpcPort,
 	}
 	for _, newVid := range resp.VolumeLocation.NewVids {
 		glog.V(2).Infof("%s.%s: %s masterClient adds volume %d", mc.FilerGroup, mc.clientType, loc.Url, newVid)