[SPARK-21219][Core] Task retry occurs on same executor due to race condition with blacklisting#18427

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ericvandenbergfb-zz wants to merge 3 commits intoapache:masterfrom

ericvandenbergfb-zz:blacklistFix

Commits on Jun 26, 2017

[SPARK-21219][scheduler] Fix race condition between adding task to pending list and updating black list state.
Eric Vandenberg
committed
Fix scalastyle issue and remove unnecessary null.
Eric Vandenberg
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Commits on Jul 7, 2017

Code review comments
Eric Vandenberg
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