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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6795) Update the document for JobConf#setNumReduceTasks
Date Wed, 02 Nov 2016 12:44:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15628848#comment-15628848
] 

Yiqun Lin commented on MAPREDUCE-6795:
--------------------------------------

Thanks [~ajisakaa] for the patient review and commit!

> Update the document for JobConf#setNumReduceTasks
> -------------------------------------------------
>
>                 Key: MAPREDUCE-6795
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6795
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Akira Ajisaka
>            Assignee: Yiqun Lin
>             Fix For: 2.8.0, 3.0.0-alpha2
>
>         Attachments: MAPREDUCE-6795.001.patch, MAPREDUCE-6795.002.patch
>
>
> The following document is for MRv1. We should update the document for MapReduce on YARN.
> {code:title=JobConf.java}
>    * <b id="NoOfReduces">How many reduces?</b>
>    * 
>    * <p>The right number of reduces seems to be <code>0.95</code> or

>    * <code>1.75</code> multiplied by (&lt;<i>no. of nodes</i>&gt;
* 
>    * <a href="{@docRoot}/../mapred-default.html#mapreduce.tasktracker.reduce.tasks.maximum">
>    * mapreduce.tasktracker.reduce.tasks.maximum</a>).
>    * </p>
> {code}



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