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https://issues.apache.org/jira/browse/MAPREDUCE-5481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13821683#comment-13821683
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Alejandro Abdelnur commented on MAPREDUCE-5481:
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LTGM, just a couple of questions/comments:
* LocalContainerLauncher.java (line:352 with patch), do we need to do something
about it: {{ //relocalize(); // needed only if more than one reducer supported
(is MAPREDUCE-434 fixed yet?)}}
* LocalContainerLauncher.java, the introduced {{localMapFiles Map}}, from a
cursory look it does not seem to be accessed from multiple threads, if so it is
fine. Else we need to use a sync/concurrent map.
> Uber job reducers hang waiting to shuffle map outputs
> -----------------------------------------------------
>
> Key: MAPREDUCE-5481
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5481
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, test
> Affects Versions: 3.0.0
> Reporter: Jason Lowe
> Assignee: Xuan Gong
> Priority: Blocker
> Attachments: MAPREDUCE-5481.patch, MAPREDUCE-5481.patch, syslog
>
>
> TestUberAM has been timing out on trunk for some time now and surefire then
> fails the build. I'm not able to reproduce it locally, but the Jenkins
> builds have been seeing it fairly consistently. See
> https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1529/console
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