Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3638#issuecomment-67918077
One potential area of concern: can any of the changes here lead to weird
re-entrant behavior? I don't think that this will happen, since the
DAGScheduler calls end up just queueing messages, but as a note-to-self I may
want to just revisit and confirm this before a final sign-off on this PR.
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