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Posted to mapreduce-dev@hadoop.apache.org by "Dongwook Kwon (JIRA)" <ji...@apache.org> on 2014/09/24 07:08:34 UTC

[jira] [Created] (MAPREDUCE-6105) Inconsistent configuration in property mapreduce.reduce.shuffle.merge.percent

Dongwook Kwon created MAPREDUCE-6105:
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             Summary: Inconsistent configuration in property mapreduce.reduce.shuffle.merge.percent
                 Key: MAPREDUCE-6105
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6105
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 2.4.1, 2.4.0
            Reporter: Dongwook Kwon
            Priority: Trivial


Similar to MAPREDUCE-5906, In MergeManagerImpl.java, the default value of MRJobConfig.SHUFFLE_MERGE_PERCENT(mapreduce.reduce.shuffle.merge.percent) should be 0.66 
According to official doc.
https://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml

{code}
    this.mergeThreshold = (long)(this.memoryLimit * 
                          jobConf.getFloat(MRJobConfig.SHUFFLE_MERGE_PERCENT, 
                                           0.90f));

{code}



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