[SPARK-27065][CORE] avoid more than one active task set managers for a stage#23927

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cloud-fan wants to merge 6 commits intoapache:masterfrom

cloud-fan:scheduler

Commits on Mar 1, 2019

avoid more than one active task set managers for a stage
cloud-fan
committed

Commits on Mar 2, 2019

fix a mistake
cloud-fan
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Commits on Mar 4, 2019

fix tests
cloud-fan
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Commits on Mar 5, 2019