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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4832) MR AM can get in a split brain situation
Date Fri, 30 Nov 2012 14:09:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507341#comment-13507341
] 

Jason Lowe commented on MAPREDUCE-4832:
---------------------------------------

MAPREDUCE-2702 is focused on FileOutputCommitter, but doesn't address the issue when that
is not the committer being used.
                
> 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: 2.0.2-alpha, 0.23.5
>            Reporter: Robert Joseph Evans
>            Priority: Critical
>
> 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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