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https://issues.apache.org/jira/browse/MAPREDUCE-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated MAPREDUCE-4832:
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Resolution: Fixed
Fix Version/s: 0.23.6
2.0.3-alpha
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Thanks for the review, Sidd. I committed this to trunk, branch-2, and
branch-0.23.
> 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
> Assignee: Jason Lowe
> Priority: Critical
> Fix For: 2.0.3-alpha, 0.23.6
>
> Attachments: MAPREDUCE-4832.patch, 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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