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https://issues.apache.org/jira/browse/MAPREDUCE-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510664#comment-13510664
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Alejandro Abdelnur commented on MAPREDUCE-4842:
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One minor NIT, the scope of exceptionReporter instance var has been changed
from private to protected for testing purposes. It should be package private
instead. And preferable, we should add a getter method instead, package private
(it could be annotated with the visiblefortesting guava annotation). Other than
that looks good to me.
> 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: Jason Lowe
> Priority: Blocker
> Attachments: 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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