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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4313) Race condition in MiniMRYarnCluster when getting history server address
Date Thu, 29 Oct 2015 07:14:27 GMT

    [ https://issues.apache.org/jira/browse/YARN-4313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979956#comment-14979956
] 

Jian He commented on YARN-4313:
-------------------------------

[~gtCarrera9], thanks for taking a look at this. This variable needs to be declared as final
since it's accessed from within an inner class. So a boolean flag may not work as it cannot
be reset ?

> 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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