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https://issues.apache.org/jira/browse/HADOOP-706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas reopened HADOOP-706:
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My bad; I misread this.
> 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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