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[SPARK-21383][YARN] Fix the YarnAllocator allocates more Resource
When NodeManagers launching Executors, the `missing` value will exceed the real value when the launch is slow, this can lead to YARN allocates more resource. We add the `numExecutorsRunning` when calculate the `missing` to avoid this. Test by experiment. Author: DjvuLee <lihu@bytedance.com> Closes #18651 from djvulee/YarnAllocate.
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DjvuLee
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Marcelo Vanzin
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Jul 25, 2017
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