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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5519) Remove claims from mapred-default.xml that prime numbers of tasks are helpful.
Date Thu, 19 Mar 2009 05:27:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683331#action_12683331
] 

Hadoop QA commented on HADOOP-5519:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12402419/remove-prime.patch
  against trunk revision 755790.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/103/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/103/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/103/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/103/console

This message is automatically generated.

> Remove claims from mapred-default.xml that prime numbers of tasks are helpful.
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-5519
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5519
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.20.0
>
>         Attachments: remove-prime.patch
>
>
> There is no value in using prime numbers for numbers of tasks. In fact, most jobs don't
even need the number of maps set, since it will increase to the number of blocks.

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