Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4135#issuecomment-77774362
I think we discussed this on the first PR, but it would be good to add an
explicit note here summarizing why we're not using `TaskCompletionListener`,
since its documentation says that it's called on all task completion events,
including success, failure, or cancellation.
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