Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/11746#issuecomment-197461487
> @zsxwing I was researching the note in ExecutorRunner here and I believe
they are talking about the WorkerWatcher. This seemed to mostly kill the driver
process but not always, e.g. right after DriverRunner.start. I just want to be
sure that it make sense to have both that and a shutdown hook in place?
WorkerWatcher counts on the network disconnect message. However, netty may
not be able to detect that. So worker should also try to kill the alive drivers.
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