Github user HeartSaVioR commented on the pull request: https://github.com/apache/storm/pull/542#issuecomment-155928236 @revans2 Yes, as I described to [JIRA issue](https://issues.apache.org/jira/browse/STORM-794?focusedCommentId=14526316&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14526316), MasterBatchCoordinator doesn't play well with async loop, since it handles emitting batch independently. MasterBatchCoordinator could make pending tuple count always same to max spout pending in point of async loop's view, which makes async loop to never trigger deactivate. I'll do upmerge and let you know. Thanks!
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