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[SPARK-20715] Store MapStatuses only in MapOutputTracker, not ShuffleMapStage#17955

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JoshRosen wants to merge 15 commits intoapache:masterfrom
JoshRosen:map-output-tracker-rewrite
Closed

[SPARK-20715] Store MapStatuses only in MapOutputTracker, not ShuffleMapStage#17955
JoshRosen wants to merge 15 commits intoapache:masterfrom
JoshRosen:map-output-tracker-rewrite

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