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https://issues.apache.org/jira/browse/HADOOP-2399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12570488#action_12570488
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Hadoop QA commented on HADOOP-2399:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12375966/2399-3.patch
against trunk revision 619744.
@author +1. The patch does not contain any @author tags.
tests included +1. The patch appears to include 8 new or modified tests.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new javac compiler
warnings.
release audit +1. The applied patch does not generate any new release
audit 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 passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1817/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1817/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1817/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1817/console
This message is automatically generated.
> Input key and value to combiner and reducer should be reused
> ------------------------------------------------------------
>
> Key: HADOOP-2399
> URL: https://issues.apache.org/jira/browse/HADOOP-2399
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.15.1
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.17.0
>
> Attachments: 2399-3.patch, reuse-obj-2.patch, reuse-obj.patch
>
>
> Currently, the input key and value are recreated on every iteration for input
> to the combiner and reducer. It would speed up the system substantially if we
> reused the keys and values. The down side of doing it, is that it may break
> applications that count on holding references to previous keys and values,
> but I think it is worth doing.
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