Avoid calling the partitioner when the numReduceTasks is 1.
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Key: MAPREDUCE-2632
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2632
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Affects Versions: 0.23.0
Reporter: Ravi Teja Ch N V
We can avoid the call to the partitioner when the number of reducers is 1.This
will avoid the unnecessary computations by the partitioner.
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