jihoonson commented on issue #7828: Supervisor marks succeeded replicas as failed too aggressively URL: https://github.com/apache/incubator-druid/issues/7828#issuecomment-498826492 I have been looking at more deeply and noticed that this is what's happening. - The task was finished and unregistered its chatHandler. - But the process which was running the task was not terminated immediately. For example, `unannouncePropagationDelay` can block the process from being terminated for a while. - The task status is updated only after the task process terminates (`ForkingTaskRunner`). - So, while the task process was waiting to be terminated, the task status in the metadata store was still `RUNNING` even though the task itself was already finished. - The supervisor killed the task because it returned an error of `Can't find chatHandler` for the shutdown request.
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