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https://issues.apache.org/jira/browse/MAPREDUCE-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185057#comment-13185057
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Robert Joseph Evans commented on MAPREDUCE-3596:
------------------------------------------------
+1 (non-binding) I just have one comment and it is very minor, so feel free to
ignore it, my +1 stands with or without it.
In RMNodeImpl getAppsToCleanup and getContainersToCleanUp. It would probably
be slightly more efficient to do something like {code}
this.readLock.lock();
try {
return new ArrayList<ContainerId>(this.containersToClean);
} finally {
this.readLock.unlock();
}{code} It will ensure that for even large arrays internally in ArrayList only
one array will need to be allocated.
> Sort benchmark got hang after completion of 99% map phase
> ---------------------------------------------------------
>
> Key: MAPREDUCE-3596
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3596
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster, mrv2
> Affects Versions: 0.23.0
> Reporter: Ravi Prakash
> Assignee: Vinod Kumar Vavilapalli
> Priority: Blocker
> Fix For: 0.23.1
>
> Attachments: MAPREDUCE-3596-20120111.1.txt,
> MAPREDUCE-3596-20120111.txt, logs.tar.bz2, logs.tar.bz2
>
>
> Courtesy [~vinaythota]
> {quote}
> Ran sort benchmark couple of times and every time the job got hang after
> completion 99% map phase. There are some map tasks failed. Also it's not
> scheduled some of the pending map tasks.
> Cluster size is 350 nodes.
> Build Details:
> ==============
> Compiled: Fri Dec 9 16:25:27 PST 2011 by someone from
> branches/branch-0.23/hadoop-common-project/hadoop-common
> ResourceManager version: revision 1212681 by someone source checksum
> on Fri Dec 9 16:52:07 PST 2011
> Hadoop version: revision 1212592 by someone Fri Dec 9 16:25:27 PST
> 2011
> {quote}
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