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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2771) changing the number of reduces dramatically changes the time of the map time
Date Tue, 25 Mar 2008 03:03:26 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-2771:
------------------------------------

    Fix Version/s:     (was: 0.17.0)

> changing the number of reduces dramatically changes the time of the map time
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-2771
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2771
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Owen O'Malley
>
> By changing the number of reduces, the time for an individual map changes radically.
By running the same program and data with different numbers of reduces (2500, 7500, 25000)
the times for each map changed radically (0:50, 1:20, 5h).

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