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https://issues.apache.org/jira/browse/MAPREDUCE-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated MAPREDUCE-4813:
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Attachment: MAPREDUCE-4813-2.patch
Updated patch to trunk and cleaned up some unused import warnings.
> AM timing out during job commit
> -------------------------------
>
> Key: MAPREDUCE-4813
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4813
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster
> Affects Versions: 0.23.3, 2.0.1-alpha
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: JobImplStateMachine.pdf, MAPREDUCE-4813-2.patch,
> MAPREDUCE-4813-2.patch, MAPREDUCE-4813-2.patch, MAPREDUCE-4813.patch,
> MAPREDUCE-4813.patch, MAPREDUCE-4813.patch
>
>
> The AM calls the output committer's {{commitJob}} method synchronously during
> JobImpl state transitions, which means the JobImpl write lock is held the
> entire time the job is being committed. Holding the write lock prevents the
> RM allocator thread from heartbeating to the RM. Therefore if committing the
> job takes too long (e.g.: the job has tons of files to commit and/or the
> namenode is bogged down) then the AM appears to be unresponsive to the RM and
> the RM kills the AM attempt.
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