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https://issues.apache.org/jira/browse/MAPREDUCE-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated MAPREDUCE-4842:
----------------------------------
Resolution: Fixed
Fix Version/s: 0.23.6
2.0.3-alpha
Status: Resolved (was: Patch Available)
Thanks, Mariappan! I committed this to trunk, branch-2, and branch-0.23.
> Shuffle race can hang reducer
> -----------------------------
>
> Key: MAPREDUCE-4842
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4842
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 2.0.2-alpha, 0.23.5
> Reporter: Jason Lowe
> Assignee: Mariappan Asokan
> Priority: Blocker
> Fix For: 2.0.3-alpha, 0.23.6
>
> Attachments: MAPREDUCE-4842-2.patch, mapreduce-4842.patch,
> mapreduce-4842.patch, mapreduce-4842.patch, mapreduce-4842.patch,
> mapreduce-4842.patch, mapreduce-4842.patch, MAPREDUCE-4842.patch,
> MAPREDUCE-4842.patch, MAPREDUCE-4842.patch, MAPREDUCE-4842.patch
>
>
> Saw an instance where the shuffle caused multiple reducers in a job to hang.
> It looked similar to the problem described in MAPREDUCE-3721, where the
> fetchers were all being told to WAIT by the MergeManager but no merge was
> taking place.
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