Details
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Improvement
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Status: Closed
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Minor
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Resolution: Fixed
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0.22.0
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None
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None
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Incompatible change, Reviewed
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For jobs with only one reducer, the Partitioner will no longer be called. Applications depending on Partitioners modifying records for single reducer jobs will need to move this functionality elsewhere.
Description
Partitioners are currently called for each record, even though all are destined for the same reduce.
Attachments
Attachments
Issue Links
- is part of
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MAPREDUCE-2632 Avoid calling the partitioner when the numReduceTasks is 1.
- Resolved