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https://issues.apache.org/jira/browse/HADOOP-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538732
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Hadoop QA commented on HADOOP-1984:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12368662/HADOOP-1984.patch
against trunk revision r589879.
@author +1. The patch does not contain any @author tags.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new compiler warnings.
findbugs +1. The patch does not introduce any new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests -1. The patch failed contrib unit tests.
Test results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1027/testReport/
Findbugs warnings:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1027/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1027/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1027/console
This message is automatically generated.
> some reducer stuck at copy phase and progress extremely slowly
> --------------------------------------------------------------
>
> Key: HADOOP-1984
> URL: https://issues.apache.org/jira/browse/HADOOP-1984
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.16.0
> Reporter: Runping Qi
> Priority: Critical
> Fix For: 0.16.0
>
> Attachments: HADOOP-1984.patch
>
>
> In many cases, some reducers got stuck at copy phase, progressing extremely
> slowly.
> The entire cluster seems doing nothing. This causes a very bad long tails of
> otherwise well tuned map/red jobs.
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