Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2436
I think that the `RpcEndpoint` should keep the control over which
components have access to its main thread and which not. Furthermore, limiting
the access to protected does not prohibit other components to use the main
thread execution context. The difference is simply that the `TaskExecutor` has
to actively give the context to the component instead of the component taking
it.
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