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https://issues.apache.org/jira/browse/YARN-4313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980727#comment-14980727
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Li Lu commented on YARN-4313:
-----------------------------

Well wait, quick question---why do we need to initialize a customized job 
history server here? I think we can directly set the flag in the thread's run() 
method, after the historyServer.start() is done? Then we can wait on the flag 
afterwards? 

> Race condition in MiniMRYarnCluster when getting history server address
> -----------------------------------------------------------------------
>
>                 Key: YARN-4313
>                 URL: https://issues.apache.org/jira/browse/YARN-4313
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-4313.1.patch
>
>
> Problem in this place when waiting for JHS to be started
> {code}
>         new Thread() {
>           public void run() {
>             historyServer.start();
>           };
>         }.start();
>         while (historyServer.getServiceState() == STATE.INITED) {
>           LOG.info("Waiting for HistoryServer to start...");
>           Thread.sleep(1500);
>         }
> {code}
> The service state is updated before the service is actually started. See 
> AbstractServic#start.  So it's possible that when the while loop breaks, the 
> service is not yet started. 



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