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https://issues.apache.org/jira/browse/YARN-5809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623807#comment-15623807
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Jian He commented on YARN-5809:
-------------------------------

[~varun_saxena], thanks for the review and commit !

> AsyncDispatcher possibly invokes multiple shutdown thread when handling 
> exception
> ---------------------------------------------------------------------------------
>
>                 Key: YARN-5809
>                 URL: https://issues.apache.org/jira/browse/YARN-5809
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>             Fix For: 2.9.0, 3.0.0-alpha2
>
>         Attachments: YARN-5809.1.patch
>
>
> below code when handling exceptions: it is possible to launch multiple 
> shutdown threads if there are events left in the queue that caused to throw 
> exceptions. 
> {code}
>     } catch (Throwable t) {
>       //TODO Maybe log the state of the queue
>       LOG.fatal("Error in dispatcher thread", t);
>       // If serviceStop is called, we should exit this thread gracefully.
>       if (exitOnDispatchException
>           && (ShutdownHookManager.get().isShutdownInProgress()) == false
>           && stopped == false) {
>         Thread shutDownThread = new Thread(createShutDownThread());
>         shutDownThread.setName("AsyncDispatcher ShutDown handler");
>         shutDownThread.start();
>       }
>     }
> {code}



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