Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/12481#issuecomment-212529389
> No the worker wasn't stopped while running this. I think this error could
be from this: when the application completes, the Master removes the
application and kill executors, but if the rpcEnv in the
CoarseGrainedExecutorBackend hasn't fully terminated then the WorkerWatcher
will receive the onDisconnect message.
Looking the related codes.
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