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https://issues.apache.org/jira/browse/YARN-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14240686#comment-14240686
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Jian He commented on YARN-2917:
-------------------------------

bq. There can be centralized single thread that does system.exit.
Then we need to send events to notify this single thread? IMO, we can keep it 
simple and just create a new thread to do sys exit.

> Potential deadlock in AsyncDispatcher when system.exit called in 
> AsyncDispatcher#dispatch and AsyscDispatcher#serviceStop from shutdown hook
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2917
>                 URL: https://issues.apache.org/jira/browse/YARN-2917
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Rohith
>            Assignee: Rohith
>            Priority: Critical
>         Attachments: 0001-YARN-2917.patch
>
>
> I encoutered scenario where RM hanged while shutting down and keep on logging 
> {{2014-12-03 19:32:44,283 INFO org.apache.hadoop.yarn.event.AsyncDispatcher: 
> Waiting for AsyncDispatcher to drain.}}



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