Jihoon Son 312cdc2452 Add TaskResourceCleaner; fix a couple of concurrency bugs in batch tasks (#8236)
* Add TaskResourceCleaner; fix a couple of concurrency bugs in batch tasks

* kill runner when it's ready

* add comment

* kill run thread

* fix test

* Take closeable out of Appenderator

* add javadoc

* fix test

* fix test

* update javadoc

* add javadoc about killed task

* address comment

* handling missing exceptions

* more clear javadoc for stopGracefully

* update javadoc

* Add missing statement in javadoc

* typo
2019-08-12 19:42:06 -05:00
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