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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-478) separate jvm param for mapper and reducer
Date Fri, 14 Aug 2009 23:05:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743483#action_12743483
] 

Tsz Wo (Nicholas), SZE commented on MAPREDUCE-478:
--------------------------------------------------

> Looks like Hudson had some trouble running tests... they work fine on my dev box.
The failing tests may be caused by HADOOP-6192 since it updated hadoop-core-0.21.0-dev.jar
in MapReduce.


> separate jvm param for mapper and reducer
> -----------------------------------------
>
>                 Key: MAPREDUCE-478
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-478
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Koji Noguchi
>            Assignee: Arun C Murthy
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5684_0_20090420.patch, MAPREDUCE-478_0_20090804.patch, MAPREDUCE-478_0_20090804_yhadoop20.patch,
MAPREDUCE-478_1_20090806.patch, MAPREDUCE-478_1_20090806_yhadoop20.patch, MAPREDUCE-478_2_20090813.patch,
MAPREDUCE-478_2_20090813.patch, MAPREDUCE-478_2_20090813_yhadoop.patch
>
>
> Memory footprint of mapper and reducer can differ. 
> It would be nice if we can pass different jvm param (mapred.child.java.opts) for mappers
and reducers.

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