address the comment

Signed-off-by: Ryan Leung <[email protected]>

pkg/keyspace/tso_keyspace_group.go

@@ -181,7 +181,7 @@ func (m *GroupManager) allocNodesToAllKeyspaceGroups(ctx context.Context) {
 			log.Info("the raftcluster is closed, stop to alloc nodes to all keyspace groups")
 			return
 		case <-ticker.C:
-			if m.nodesBalancer.Len() == 0 {
+			if m.GetNodesCount() == 0 {
 				continue
 			}
 		}