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https://issues.apache.org/jira/browse/YARN-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866042#comment-13866042
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Xuan Gong commented on YARN-1574:
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+1 on option2. But I think that the resetDispatcher method should only be
called when RM transits from Active to Standby.
> When RM transit from Active to Standby, the same eventDispatcher should not
> be registered more than once
> --------------------------------------------------------------------------------------------------------
>
> Key: YARN-1574
> URL: https://issues.apache.org/jira/browse/YARN-1574
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Xuan Gong
> Assignee: Xuan Gong
> Priority: Blocker
> Attachments: YARN-1574.1.patch
>
>
> Currently, we move rmDispatcher out of ActiveService. But we still register
> the Event dispatcher, such as schedulerDispatcher, RMAppEventDispatcher when
> we initiate the ActiveService.
> Almost every time when we transit RM from Active to Standby, we need to
> initiate the ActiveService. That means we will register the same event
> Dispatcher which will cause the same event will be handled several times.
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