update insert pending segments logic to synchronous#6336

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jihoonson merged 5 commits intoapache:masterfrom

FaxianZhao:sync_insert_pendingSegments

Oct 23, 2018

Commits on Sep 17, 2018

1. Mysql default transaction isolation is REPEATABLE_READ, treat it as READ_COMMITTED will reduce insert id conflict.
zhaofaxian
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Commits on Oct 8, 2018

Merge branch 'master' into sync_insert_pendingSegments
zhaofaxian
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Use TaskLockbox.doInCriticalSection instead of synchronized syntax to speed up insert pending segments.
zhaofaxian
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Commits on Oct 22, 2018

Merge branch 'master' into sync_insert_pendingSegments
zhaofaxian
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fix typo for NullPointerException
zhaofaxian
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