Github user rmetzger commented on the pull request: https://github.com/apache/flink/pull/750#issuecomment-142331659 I think the implementation of `stopExecution()` is fine. You are executing the call in a separate thread and you are logging exceptions. A blocking stop() method implemented by a user would not block the actor. I would catch `Throwable` instead of `RuntimeException`, just to ensure that really no exception is thrown out of the thread. This PR is touching very critical components of Flink. I would really appreciate a review by @tillrohrmann and @StephanEwen.
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