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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4437) Race in MR ApplicationMaster can cause reducers to never be scheduled
Date Fri, 13 Jul 2012 21:02:35 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated MAPREDUCE-4437:
----------------------------------

            Assignee: Jason Lowe
    Target Version/s: 0.23.3, 2.0.1-alpha
              Status: Patch Available  (was: Open)
    
> Race in MR ApplicationMaster can cause reducers to never be scheduled
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4437
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4437
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mrv2
>    Affects Versions: 0.23.3, 2.0.1-alpha
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-4437.patch
>
>
> If the MR AM is notified of container completion by the RM before the AM receives notification
of the container cleanup from the NM then it can fail to schedule reducers indefinitely. 
Logs showing the issue to follow.

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