Github user kayousterhout commented on the pull request:
https://github.com/apache/spark/pull/892#issuecomment-45247880
@lirui-intel I still don't understand the problem you mentioned: in
TaskSetManager.findTask(), it tries to schedule process local, node local, and
rack local tasks before looking at tasks from pendingTasksWithNoPrefs. So how
can a task from pendingTasksWithNoPrefs be scheduled before a PROCESS_LOCAL
one? (I see that tasks from pendingTasksWithNoPrefs are marked with locality
level PROCESS_LOCAL when they're launched -- but this doesn't look like it
affects the scheduling order)
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