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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-511) mapred.reduce.tasks not used
Date Thu, 24 May 2007 06:42:16 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Owen O'Malley resolved HADOOP-511.
----------------------------------

    Resolution: Duplicate

This was mostly misconfiguration by having the site file override the job's wishes. Note that
now reduces = 0 is not an error, but rather specifying that you don't need a sort.

> mapred.reduce.tasks not used
> ----------------------------
>
>                 Key: HADOOP-511
>                 URL: https://issues.apache.org/jira/browse/HADOOP-511
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.5.0
>            Reporter: Uros Gruber
>         Assigned To: Owen O'Malley
>
> After some testing with nutch I found problem with ArithmeticException in partition function
because numReduceTasks came in 0. After seting mapred.reduce.tasks in hadoop-site.xml to same
value as default everything works.
> This bug disappear in SVN version of hadoop
> I this known issue. Please check also NUTCH-361 for detail explanation.

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