xieshouyu opened a new pull request, #12796:
URL: https://github.com/apache/dubbo/pull/12796

   ## What is the purpose of the change
   When the zookeeper is disconnected, the dubbo actor check registry health 
will be stuck instead of returning to Down
   I hope the result is to return to the Down state
   
   The reason is that the isAvailable method calls the getServices method of 
zookeeper, causing continuous retries. When determining whether it is 
available, it is necessary to first determine whether it is connected before 
obtaining it.
   
   ## Brief changelog
   
   1、Fix the issue of timeout for all calls to the isAvailable method after the 
zookeeper is disconnected
   2、Move the isAvailable of NopServiceDiscovery into its own implementation 
class
   
   ## Verifying this change
   Start the service, use pfctl or iptables to disconnect zookeeper, and it can 
return to the down state normally.
   
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