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From "Ray Chiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6105) Inconsistent configuration in property mapreduce.reduce.shuffle.merge.percent
Date Mon, 16 Mar 2015 21:06:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14363945#comment-14363945
] 

Ray Chiang commented on MAPREDUCE-6105:
---------------------------------------

Thanks for the review and commit!

> 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: 2.4.0, 2.4.1
>            Reporter: Dongwook Kwon
>            Assignee: Ray Chiang
>            Priority: Trivial
>              Labels: newbie
>             Fix For: 2.8.0
>
>         Attachments: MAPREDUCE-6105-01.patch, MAPREDUCE-6105.patch
>
>
> 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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