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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2009/03/17 22:05:50 UTC

[jira] Updated: (HADOOP-5519) Remove claims from mapred-default.xml that prime numbers of tasks are helpful.

     [ https://issues.apache.org/jira/browse/HADOOP-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley updated HADOOP-5519:
----------------------------------

    Status: Patch Available  (was: Open)

> 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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