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Posted to common-dev@hadoop.apache.org by "Nigel Daley (JIRA)" <ji...@apache.org> on 2006/11/10 03:23:37 UTC

[jira] Created: (HADOOP-706) Optomize reduce phase when there is no map output

Optomize reduce phase when there is no map output
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                 Key: HADOOP-706
                 URL: http://issues.apache.org/jira/browse/HADOOP-706
             Project: Hadoop
          Issue Type: Improvement
          Components: mapred
    Affects Versions: 0.8.0
            Reporter: Nigel Daley


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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