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From "Mahadev konar (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-2504) MR 279: race in JobHistoryEventHandler stop
Date Wed, 18 May 2011 00:17:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mahadev konar resolved MAPREDUCE-2504.
--------------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

I just committed this to MR-279. thanks sid!

> MR 279: race in JobHistoryEventHandler stop 
> --------------------------------------------
>
>                 Key: MAPREDUCE-2504
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2504
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>             Fix For: 0.23.0
>
>         Attachments: MR2504.patch, MR2504_2.patch, MR2504_3.patch
>
>
> The condition to stop the eventHandling thread currently requires it to be 'stopped'
AND interrupted. If an interrupt arrives after a take, but before handleEvent is called -
the interrupt status ends up being handled by hadoop.util.Shell.runCommand() - which ignores
it (and in the process resets the flag).
> The eventHandling thread subsequently hangs on eventQueue.take()
> This currently randomly fails unit tests - and can hang MR AMs.

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