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Posted to mapreduce-dev@hadoop.apache.org by "Akira Ajisaka (JIRA)" <ji...@apache.org> on 2016/10/17 05:11:58 UTC
[jira] [Created] (MAPREDUCE-6795) Update the document for
JobConf#setNumReduceTasks
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 (<<i>no. of nodes</i>> *
* <a href="{@docRoot}/../mapred-default.html#mapreduce.tasktracker.reduce.tasks.maximum">
* mapreduce.tasktracker.reduce.tasks.maximum</a>).
* </p>
{code}
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