Github user davies commented on the pull request:
https://github.com/apache/spark/pull/1643#issuecomment-50700224
I had tried these two approach, we have not easy way to get PIDs of
workers, because it's platform dependent. Sending command to Python daemon will
also need the identity of worker, it will need another channel to send commands.
If there are exceptions in Java reading/writing threads, which may lead to
close the socket, so we still need this kind of method to kill worker if the
socket is closed.
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