[SPARK-30246][CORE] OneForOneStreamManager might leak memory in connectionTerminated#27064

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hensg wants to merge 6 commits intoapache:masterfrom

hensg:SPARK-30246

Commits on Jan 2, 2020

OneForOneStreamManager might leak memory in connectionTerminated
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Add try-catch block to release buffers for all removedStates even there's any exception on releasing any state.
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Commits on Jan 9, 2020

Commits on Jan 13, 2020

Remove extra blank line
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Commits on Jan 14, 2020

Store first exception and re-throw it
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