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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-706) Optomize reduce phase when there is no map output
Date Tue, 04 Mar 2008 22:15:40 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas resolved HADOOP-706.
----------------------------------

    Resolution: Duplicate

This was resolved in HADOOP-1216

> Optomize reduce phase when there is no map output
> -------------------------------------------------
>
>                 Key: HADOOP-706
>                 URL: https://issues.apache.org/jira/browse/HADOOP-706
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.8.0
>            Reporter: Nigel Daley
>            Assignee: Owen O'Malley
>
> When a map produces no output (does not call the collector), it seems desirable that
the reduce phase should not attempt to download the 0 length map output file.

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