Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1313#issuecomment-49210568
Ah, I see, so you're saying it's worth to wait 3 seconds for node-local
ones to be able to go instead of launching no-prefs tasks. That does make
sense. We just have to make sure that if a task set contains *only*
process-local and no-prefs tasks, for instance, this wait doesn't happen. (I'm
pretty sure that right now we don't wait for node-local if there were no
process-local tasks, right? We only wait when we move up a level.)
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