Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/339#issuecomment-69296809
I have some suggestion:
* StageState.FINALIZE should be StageState.FINALIZING because it's a
continuing state while receiving shuffle reports.
* lastContactTime does not need to be AtomicLong because lastContactTime
update will be serialized by event handler.
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