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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