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https://issues.apache.org/jira/browse/HADOOP-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688041#action_12688041
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Hudson commented on HADOOP-5519:
--------------------------------
Integrated in Hadoop-trunk #786 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/786/])
. Remove claims from mapred-default.xml that prime numbers of tasks are
helpful. (Owen O'Malley via szetszwo)
> 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, 0.21.0
>
> 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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