Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4066#issuecomment-72770487
> Still, though, I'd like to consider whether there's a good way to fix
this in order to guarantee that requests to commit output for a stage occur
after the stage start event (from the OutputCommitter's POV).
I handed this by refactoring the code so that only remote RPCs are routed
through the actor. The methods called by DAGScheduler are now `synchronized`
and directly update the hashmaps.
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