Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8887#issuecomment-148865650
> So what do those calls do?
My understanding is that you may have pending tasks waiting to be run on
that executor (because of PROCESS_LOCAL locality? NODE_LOCAL locality?), and
they aren't being executed because the executor is busy running another task.
So if that running task finishes, one of these pending tasks would be run on
the now free executor (or if the locality timeouts trigger, then things would
be reallocated).
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