[WIP][SPARK-20629][CORE] Copy shuffle data when nodes are being shutdown#28331

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holdenk wants to merge 32 commits intoapache:masterfrom

holdenk:SPARK-20629-copy-shuffle-data-when-nodes-are-being-shutdown-flat

Commits on Apr 24, 2020

Commits on May 1, 2020

Commits on May 2, 2020

Try and update the tests some more, switch migration to not make a new forkjoinpool on each iteration
holdenk
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Commits on May 26, 2020

Code cleanups (swap some maps for foreach where we didn't need the results & fix some potential test flakes) as suggested by @attilapiros during review (thanks)
holdenk
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Merge branch 'master' into SPARK-20629-copy-shuffle-data-when-nodes-are-being-shutdown-flat
holdenk
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Add missing follow up commit from merge
holdenk
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Commits on May 28, 2020

Commits on May 29, 2020

Commits on Jun 1, 2020

Commits on Jun 2, 2020