[SPARK-16533][CORE] resolve deadlocking in driver when executors die#14710

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angolon wants to merge 8 commits intoapache:masterfrom

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Commits on Aug 19, 2016

Revert "[SPARK-17022][YARN] Handle potential deadlock in driver handling messages"
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[SPARK-16533][CORE] Use scheduleWithFixedDelay when calling ExecutorAllocatorManager.schedule to ease contention on locks.
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[SPARK-16533][CORE] Replace many calls to askWithRetry to plain old ask.
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Commits on Aug 25, 2016

[SPARK-16533][CORE] fix scalastyle errors.
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Commits on Aug 30, 2016

Commits on Aug 31, 2016

[SPARK-16533][CORE] tidy up unused import.
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Commits on Sep 1, 2016

Merge remote-tracking branch 'apache/master' into SPARK-16533
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