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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4832) MR AM can get in a split brain situation
Date Wed, 02 Jan 2013 21:46:14 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated MAPREDUCE-4832:
----------------------------------

            Assignee: Jason Lowe
    Target Version/s: 2.0.3-alpha, 0.23.6
              Status: Patch Available  (was: Open)
    
> MR AM can get in a split brain situation
> ----------------------------------------
>
>                 Key: MAPREDUCE-4832
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4832
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster
>    Affects Versions: 0.23.5, 2.0.2-alpha
>            Reporter: Robert Joseph Evans
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-4832.patch
>
>
> It is possible for a networking issue to happen where the RM thinks an AM has gone down
and launches a replacement, but the previous AM is still up and running.  If the previous
AM does not need any more resources from the RM it could try to commit either tasks or jobs.
 This could cause lots of problems where the second AM finishes and tries to commit too. 
This could result in data corruption.  

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