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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-164) Race condition in Fair Scheduler
Date Wed, 07 Nov 2012 14:23:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492373#comment-13492373
] 

Tom White commented on YARN-164:
--------------------------------

+1. I've just triggered Jenkins for this patch. The lack of a unit test is OK since it's very
hard to test for the absence of a race condition.
                
> Race condition in Fair Scheduler
> --------------------------------
>
>                 Key: YARN-164
>                 URL: https://issues.apache.org/jira/browse/YARN-164
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 2.0.2-alpha
>            Reporter: Devaraj K
>            Assignee: Devaraj K
>            Priority: Critical
>         Attachments: YARN-164.patch
>
>
> {code:xml}
>       Thread updateThread = new Thread(new UpdateThread());
>       updateThread.start();
>       initialized = true;
> {code}
> In the above code, making the initialized as true after starting the UpdateThread.
> {code:xml}
>   private class UpdateThread implements Runnable {
>     public void run() {
>       while (initialized) {
>         try {
>           Thread.sleep(UPDATE_INTERVAL);
>           update();
>           preemptTasksIfNecessary();
>         } catch (Exception e) {
>           LOG.error("Exception in fair scheduler UpdateThread", e);
>         }
>       }
>     }
>   }
>  {code}
>  In this run method of UpdateThread, it is checking for the initialized and exiting if
it is not true. Here most of the times initialized is getting true after exiting the UpdateThread
and the thread functionality is missing, due to that all the submitted applications are hanging
without making any progress.

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