rkhachatryan opened a new pull request #18546:
URL: https://github.com/apache/flink/pull/18546


   ```
   CheckpointCoordinator doesn't expect to receive the same object more than 
once:
   in production environment, state handles are (de)serialized while sending 
via RPC.
   
   However, in tests, local RPC may be used, without (de)serialization. This 
causes
   test failures when using state backends which re-use objects (e.g. 
materialized
   state of ChangelogStateBackend).
   Using the same KeyedStateHandle *object* should be allowed for backends.
   
   This change makes AkkaInvocationHandler always use RemoteRPCInvocation.
   ```


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