fuziye01 commented on a change in pull request #817:
URL: 
https://github.com/apache/servicecomb-service-center/pull/817#discussion_r553703020



##########
File path: syncer/server/server.go
##########
@@ -297,10 +299,15 @@ func instFromOtherSC(instance *dump.Instance, m 
*pb.MappingEntry) bool {
 func (s *Server) addToQueue(event *dump.WatchInstanceChangedEvent) {
        mapping := s.servicecenter.GetSyncMapping()
 
-       for _, m := range mapping {
+       for index, m := range mapping {
                if instFromOtherSC(event.Instance, m) {
-                       log.Debugf("instance[curId:%s, originId:%s] is from 
another sc, no need to put to queue",
-                               m.CurInstanceID, m.OrgInstanceID)
+                       log.Debug(fmt.Sprintf("instance[curId:%s, originId:%s] 
is from another sc, no need to put to queue",
+                               m.CurInstanceID, m.OrgInstanceID))
+
+                       if event.Action == string(discovery.EVT_DELETE) {
+                               mapping = append(mapping[:index], 
mapping[index+1:]...)

Review comment:
       mapping[index+1]是否会越界?




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