Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1313#issuecomment-50291398
I think you should call it with NO_PREF after NODE_LOCAL, but never wait
inside resourceOffer if the level is set to NO_PREF. That is, if the
TaskSetManager did return a task during the NODE_LOCAL call (either because it
had one or because its delay was up), that's good, but if it didn't, it gets to
launch a NO_PREFS one even without waiting further.
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