Change nodeName to clusterName in storage
diff --git a/syncer/etcd/storage.go b/syncer/etcd/storage.go
index b1e4f7f..36995a3 100644
--- a/syncer/etcd/storage.go
+++ b/syncer/etcd/storage.go
@@ -94,8 +94,8 @@
 	}
 }
 
-// UpdateMapByNode update map to storage by clusterName of other node
-func (s *storage) UpdateMapByNode(clusterName string, mapping pb.SyncMapping) {
+// UpdateMapByCluster update map to storage by clusterName of other cluster
+func (s *storage) UpdateMapByCluster(clusterName string, mapping pb.SyncMapping) {
 	newMaps := make(pb.SyncMapping, 0, len(mapping))
 	for _, val := range mapping {
 		key := mappingsKey + "/" + clusterName + "/" + val.OrgInstanceID
@@ -110,11 +110,11 @@
 		}
 		newMaps = append(newMaps, val)
 	}
-	s.cleanExpired(s.GetMapByNode(clusterName), newMaps)
+	s.cleanExpired(s.GetMapByCluster(clusterName), newMaps)
 }
 
-// GetMapByNode get map by clusterName of other node
-func (s *storage) GetMapByNode(clusterName string) (mapping pb.SyncMapping) {
+// GetMapByCluster get map by clusterName of other cluster
+func (s *storage) GetMapByCluster(clusterName string) (mapping pb.SyncMapping) {
 	maps := make(pb.SyncMapping, 0, 10)
 	s.getPrefixKey(mappingsKey+"/"+clusterName, func(key, val []byte) (next bool) {
 		next = true
diff --git a/syncer/pkg/mock/mocksotrage/storage.go b/syncer/pkg/mock/mocksotrage/storage.go
index 36a1685..11b7284 100644
--- a/syncer/pkg/mock/mocksotrage/storage.go
+++ b/syncer/pkg/mock/mocksotrage/storage.go
@@ -57,15 +57,15 @@
 	return
 }
 
-// UpdateMapByNode update map to storage by clusterName of other node
-func (s *Storage) UpdateMapByNode(clusterName string, mapping pb.SyncMapping) {
+// UpdateMapByCluster update map to storage by clusterName of other cluster
+func (s *Storage) UpdateMapByCluster(clusterName string, mapping pb.SyncMapping) {
 	s.lock.Lock()
 	s.maps[clusterName] = mapping
 	s.lock.Unlock()
 }
 
-// GetMapByNode get map by clusterName of other node
-func (s *Storage) GetMapByNode(clusterName string) (mapping pb.SyncMapping) {
+// GetMapByCluster get map by clusterName of other cluster
+func (s *Storage) GetMapByCluster(clusterName string) (mapping pb.SyncMapping) {
 	s.lock.RLock()
 	data, ok := s.maps[clusterName]
 	if !ok {
diff --git a/syncer/servicecenter/servicecenter.go b/syncer/servicecenter/servicecenter.go
index b6f5446..a2da4ad 100644
--- a/syncer/servicecenter/servicecenter.go
+++ b/syncer/servicecenter/servicecenter.go
@@ -42,8 +42,8 @@
 	UpdateData(data *pb.SyncData)
 	GetMaps() (maps pb.SyncMapping)
 	UpdateMaps(maps pb.SyncMapping)
-	GetMapByNode(clusterName string) (mapping pb.SyncMapping)
-	UpdateMapByNode(clusterName string, mapping pb.SyncMapping)
+	GetMapByCluster(clusterName string) (mapping pb.SyncMapping)
+	UpdateMapByCluster(clusterName string, mapping pb.SyncMapping)
 }
 
 // NewServicecenter new store with endpoints
@@ -79,7 +79,7 @@
 
 // Registry registry data to the servicecenter, update mapping data
 func (s *servicecenter) Registry(clusterName string, data *pb.SyncData) {
-	mapping := s.storage.GetMapByNode(clusterName)
+	mapping := s.storage.GetMapByCluster(clusterName)
 	for _, svc := range data.Services {
 		log.Debugf("trying to do registration of service, serviceID = %s", svc.Service.ServiceId)
 		// If the svc is in the mapping, just do nothing, if not, created it in servicecenter and get the new serviceID
@@ -110,8 +110,8 @@
 	}
 	// UnRegistry instances that is not in the data which means the instance in the mapping is no longer actived
 	mapping = s.unRegistryInstances(data, mapping)
-	// Update mapping data of the node to the storage of the servicecenter
-	s.storage.UpdateMapByNode(clusterName, mapping)
+	// Update mapping data of the cluster to the storage of the servicecenter
+	s.storage.UpdateMapByCluster(clusterName, mapping)
 }
 
 // Discovery discovery data from storage
diff --git a/syncer/servicecenter/servicecenter_test.go b/syncer/servicecenter/servicecenter_test.go
index 7036b9d..d12d874 100644
--- a/syncer/servicecenter/servicecenter_test.go
+++ b/syncer/servicecenter/servicecenter_test.go
@@ -79,7 +79,7 @@
 		return
 	}
 
-	clusterName := "test_node"
+	clusterName := "test_cluster"
 	dc.Registry(clusterName, data)
 
 	mockplugin.SetGetAll(mockplugin.NewGetAll)