[jira] Created: (HADOOP-2959) When a mapper needs to run a combiner, it should create one and reuse it, instead of creating one per partition per spill

[Runping Qi (JIRA)]

When a mapper needs to run a combiner, it should create one and reuse it, 
instead of creating one per partition per spill
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                 Key: HADOOP-2959
                 URL: https://issues.apache.org/jira/browse/HADOOP-2959
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.16.0
            Reporter: Runping Qi




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