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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5519) Remove claims from mapred-default.xml that prime numbers of tasks are helpful.
Date Sat, 21 Mar 2009 01:18:50 GMT

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

Tsz Wo (Nicholas), SZE updated HADOOP-5519:
-------------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.21.0
           Status: Resolved  (was: Patch Available)

I committed this to 0.20 and above.  Thanks, Owen!

> 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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