Mulavar commented on code in PR #1969:
URL: https://github.com/apache/dubbo-go/pull/1969#discussion_r922648108


##########
registry/polaris/core.go:
##########
@@ -86,34 +86,36 @@ func (watcher *PolarisServiceWatcher) startWatch() {
                        Value:      resp.GetAllInstancesResp.Instances,
                        ConfigType: remoting.EventTypeAdd,
                })
-
-               select {
-               case event := <-resp.EventChannel:
-                       eType := event.GetSubScribeEventType()
-                       if eType == api.EventInstance {
-                               insEvent := event.(*model.InstanceEvent)
-                               if insEvent.AddEvent != nil {
-                                       
watcher.notifyAllSubscriber(&config_center.ConfigChangeEvent{
-                                               Value:      
insEvent.AddEvent.Instances,
-                                               ConfigType: 
remoting.EventTypeAdd,
-                                       })
-                               }
-                               if insEvent.UpdateEvent != nil {
-                                       instances := make([]model.Instance, 
len(insEvent.UpdateEvent.UpdateList))
-                                       for i := range 
insEvent.UpdateEvent.UpdateList {
-                                               instances[i] = 
insEvent.UpdateEvent.UpdateList[i].After
+               for {
+                       select {
+                       case event := <-resp.EventChannel:
+                               eType := event.GetSubScribeEventType()
+                               if eType == api.EventInstance {
+                                       insEvent := event.(*model.InstanceEvent)
+                                       if insEvent.AddEvent != nil {
+                                               
watcher.notifyAllSubscriber(&config_center.ConfigChangeEvent{
+                                                       Value:      
insEvent.AddEvent.Instances,
+                                                       ConfigType: 
remoting.EventTypeAdd,
+                                               })
+                                       }
+                                       if insEvent.UpdateEvent != nil {
+                                               instances := 
make([]model.Instance, len(insEvent.UpdateEvent.UpdateList))
+                                               for i := range 
insEvent.UpdateEvent.UpdateList {
+                                                       instances[i] = 
insEvent.UpdateEvent.UpdateList[i].After
+                                               }
+                                               
watcher.notifyAllSubscriber(&config_center.ConfigChangeEvent{
+                                                       Value:      instances,
+                                                       ConfigType: 
remoting.EventTypeUpdate,
+                                               })
+                                       }
+                                       if insEvent.DeleteEvent != nil {
+                                               
watcher.notifyAllSubscriber(&config_center.ConfigChangeEvent{
+                                                       Value:      
insEvent.DeleteEvent.Instances,
+                                                       ConfigType: 
remoting.EventTypeDel,
+                                               })

Review Comment:
   this code snippet looks like a dead loop and when can we break out of the 
loop?



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