[SPARK-23637][YARN]Yarn might allocate more resource if a same executor is killed multiple times.#20781

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Commits on Mar 9, 2018

[SPARK-23637][YARN]Yarn might allocate more resource if a same executor is killed multiple times.
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it's possible that YarnAllocator process same completed container multiple times.
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Commits on Mar 12, 2018

Use runningExecutors as a set.
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