[jira] [Created] (FLINK-11551) Allow RpcEndpoints to execute asynchronous stop operations

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-11551:
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             Summary: Allow RpcEndpoints to execute asynchronous stop operations
                 Key: FLINK-11551
                 URL: https://issues.apache.org/jira/browse/FLINK-11551
             Project: Flink
          Issue Type: Improvement
          Components: Distributed Coordination
    Affects Versions: 1.7.1, 1.8.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.8.0


Some {{RpcEndpoints}} would benefit from being able to run asynchronous stop operations in the main thread executor. At the moment, this is not possible since {{RpcEndpoint#postStop}} is called by by {{UntypedActor#postStop}} which is the last call for an actor.

I suggest to introduce a new method {{RpcEndpoint#onStop}} which is executed when the {{RpcEndpoint}} is requested to terminate. Internally, this method will be called when the {{UntypedActor}} is still running, thus, allowing to execute arbitrary other messages (e.g. asynchronous operations in the main thread executor). Only after the future returned by {{onStop}} is completed, the underlying {{UntypedActor}} will shut down.



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