[SPARK-23811][Core] FetchFailed comes before Success of same task will cause child stage never succeed#20930

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Commits on Apr 16, 2018

[SPARK-23811][Core] Same tasks' FetchFailed event comes before Success will cause child stage never succeed
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Ignore success event for fetching failed task
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Delete useless code
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Commits on Apr 18, 2018

Commits on Apr 25, 2018

Commits on Apr 26, 2018

Fix this at the beggening of handleTaskCompletion
xuanyuanking
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