You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-issues@hadoop.apache.org by "Akira Ajisaka (JIRA)" <ji...@apache.org> on 2016/11/01 11:50:58 UTC
[jira] [Commented] (MAPREDUCE-6795) Update the document for
JobConf#setNumReduceTasks
[ https://issues.apache.org/jira/browse/MAPREDUCE-6795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625225#comment-15625225 ]
Akira Ajisaka commented on MAPREDUCE-6795:
------------------------------------------
+1, committing this.
> 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
> 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 (<<i>no. of nodes</i>> *
> * <a href="{@docRoot}/../mapred-default.html#mapreduce.tasktracker.reduce.tasks.maximum">
> * mapreduce.tasktracker.reduce.tasks.maximum</a>).
> * </p>
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: mapreduce-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: mapreduce-issues-help@hadoop.apache.org