initial

weed/pb/master_pb/master.pb.go

@@ -784,6 +784,7 @@ type VolumeLocation struct {
 	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
 }
 
 func (x *VolumeLocation) Reset() {

weed/server/master_grpc_server.go

@@ -31,6 +31,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			message := &master_pb.VolumeLocation{
 				Url:        dn.Url(),
 				PublicUrl:  dn.PublicUrl,
+				DataCenter: dn.GetDataCenter().String(),
 			}
 			for _, v := range dn.GetVolumes() {
 				message.DeletedVids = append(message.DeletedVids, uint32(v.Id))
@@ -88,6 +89,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 		message := &master_pb.VolumeLocation{
 			Url:        dn.Url(),
 			PublicUrl:  dn.PublicUrl,
+			DataCenter: dn.GetDataCenter().String(),
 		}
 		if len(heartbeat.NewVolumes) > 0 || len(heartbeat.DeletedVolumes) > 0 {
 			// process delta volume ids if exists for fast volume id updates

weed/topology/topology_map.go

@@ -64,6 +64,7 @@ func (t *Topology) ToVolumeLocations() (volumeLocations []*master_pb.VolumeLocat
 				volumeLocation := &master_pb.VolumeLocation{
 					Url:        dn.Url(),
 					PublicUrl:  dn.PublicUrl,
+					DataCenter: dn.GetDataCenter().String(),
 				}
 				for _, v := range dn.GetVolumes() {
 					volumeLocation.NewVids = append(volumeLocation.NewVids, uint32(v.Id))

weed/wdclient/masterclient.go

@@ -132,6 +132,7 @@ func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader stri
 			loc := Location{
 				Url:        volumeLocation.Url,
 				PublicUrl:  volumeLocation.PublicUrl,
+				DataCenter: volumeLocation.DataCenter,
 			}
 			for _, newVid := range volumeLocation.NewVids {
 				glog.V(1).Infof("%s: %s masterClient adds volume %d", mc.clientType, loc.Url, newVid)

weed/wdclient/vid_map.go

@@ -18,6 +18,7 @@ const (
 type Location struct {
 	Url        string `json:"url,omitempty"`
 	PublicUrl  string `json:"publicUrl,omitempty"`
+	DataCenter string `json:"dataCenter,omitempty"`
 }
 
 type vidMap struct {