Jihoon Son 86746f82d8 Use mergeBuffer instead of processingBuffer in parallelCombiner (#5634)
* Use mergeBuffer instead of processingBuffer in parallelCombiner

* Fix test

* address comments

* fix test

* Fix test

* Update comment

* address comments

* fix build

* Fix test failure
2018-04-27 18:14:37 -07:00
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