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From "Akira Ajisaka (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6795) Update the document for JobConf#setNumReduceTasks
Date Mon, 17 Oct 2016 05:11:58 GMT
Akira Ajisaka created MAPREDUCE-6795:
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             Summary: 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


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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