finefuture commented on PR #13942:
URL: https://github.com/apache/dubbo/pull/13942#issuecomment-2005684209

   > However, this still cannot resolve the ABC issue. 
![image](https://private-user-images.githubusercontent.com/9292748/313888281-5bd774f0-8e7a-4bc1-bed3-483020b69f18.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.FpjNzrT3E3kJkBAdiUfcFBTz780R3K91_ICjpy7ZObo)
   
   I think there are three solutions:
   1. Add version to instance and compare version.
   2. The registry center triggers an event push for all instances when a 
subscription request is received.
   3. Lock getAllInstance and notify to ensure that getAllInstance is executed 
first.


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