[jira] [Updated] (YARN-164) Race condition in Fair Scheduler

["Devaraj K (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Devaraj K updated YARN-164:
---------------------------

    Attachment: YARN-164.patch

Attaching the straightforward patch to fix this issue.
                
> 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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