Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9946#issuecomment-173664570
Sure, but it becomes much more likely to bite if you always kill the
threads immediately, if they're still running, rather than have them killed a
little bit later by YARN. Are you saying YARN immediately kills the container
here? then in practice agree. Otherwise this seems like a coherent concern; you
may not think it's worth worrying about but it's not hard to grok
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