Github user uce commented on the issue: https://github.com/apache/flink/pull/2652 We have the `TaskManagerProcessReapingTest` which tests that the TaskManager process properly exits when the TaskManager actor dies. In addition, there is `TaskManagerTest#testTerminationOnFatalError`, which tests that the `FatalError` message terminates the actor. Do you think we are already covered by this? We can certainly add a process reaper test variant that sends a `FatalError` message instead of the `PoisonPill`.
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