[jira] [Created] (FLINK-15693) Stop receiving incoming RPC messages when RpcEndpoint is closing

["Till Rohrmann (Jira)" <ji...@apache.org>]

Till Rohrmann created FLINK-15693:
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             Summary: Stop receiving incoming RPC messages when RpcEndpoint is closing
                 Key: FLINK-15693
                 URL: https://issues.apache.org/jira/browse/FLINK-15693
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
    Affects Versions: 1.9.1, 1.10.0
            Reporter: Till Rohrmann
             Fix For: 1.11.0


When calling {{RpcEndpoint#closeAsync()}}, the system triggers {{RpcEndpoint#onStop}} and transitions the endpoint into the {{TerminatingState}}. In order to allow asynchronous clean up operations, the main thread executor is not shut down immediately. As a side effect, the {{RpcEndpoint}} still accepts incoming RPC messages from other components. 

I think it would be cleaner to no longer accept incoming RPC messages once we are in the {{TerminatingState}}. That way we would not worry about the internal state of the {{RpcEndpoint}} when processing RPC messages (similar to [here|https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskExecutor.java#L952]).



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