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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2771) changing the number of reduces dramatically changes the time of the map time
Date Wed, 26 Nov 2008 02:16:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650844#action_12650844
] 

Christian Kunz commented on HADOOP-2771:
----------------------------------------

In my view this is no longer much of an issue.

> 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
>    Affects Versions: 0.17.1
>            Reporter: Owen O'Malley
>             Fix For: 0.20.0
>
>
> 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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