Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/4420
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GitHub user tillrohrmann opened a pull request:
https://github.com/apache/flink/pull/4420
[FLINK-7295] [rpc] Add postStop callback for proper shutdown of RpcEndpoints
## What is the purpose of the change
In order to execute a proper shutdown of RpcEndpoints it is necessary
