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https://issues.apache.org/jira/browse/YARN-5375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612189#comment-15612189
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sandflee commented on YARN-5375:
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Thanks [~rohithsharma], yes, MockRM#createSchedulerEventDispatcher triggers the
deadlock. NodeAddEvent used to left in schedule event queue now get processed.
agree that using resourcemanager.handle(nodeUpdate) could solve this bug.
and this test seems very special, only rm dispatcher started.
> invoke MockRM#drainEvents implicitly in MockRM methods to reduce test failures
> ------------------------------------------------------------------------------
>
> Key: YARN-5375
> URL: https://issues.apache.org/jira/browse/YARN-5375
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: sandflee
> Assignee: sandflee
> Attachments: YARN-5375.01.patch, YARN-5375.03.patch,
> YARN-5375.04.patch, YARN-5375.05.patch, YARN-5375.06.patch,
> YARN-5375.07-drain-statestore.patch, YARN-5375.07-sync-statestore.patch,
> YARN-5375.08.patch
>
>
> seen many test failures related to RMApp/RMAppattempt comes to some state but
> some event are not processed in rm event queue or scheduler event queue,
> cause test failure, seems we could implicitly invokes drainEvents(should also
> drain sheduler event) in some mockRM method like waitForState
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