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Date: Wed, 11 Aug 2010 08:12:17 -0400 (EDT)
From: "Vladimir Klimontovich (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-2003) It should be able to specify
 different jvm settings for map and reduce child process (via
 mapred.child.map.java.opts and mapred.child.reduce.java.opts options)
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It should be able to specify different jvm settings for map and reduce child process (via mapred.child.map.java.opts and mapred.child.reduce.java.opts options) 
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                 Key: MAPREDUCE-2003
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2003
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: tasktracker
            Reporter: Vladimir Klimontovich
             Fix For: 0.20.3, 0.21.0, 0.22.0


Sometimes mapper child process requires different JVM settings than reducer. For example when mapper requires much more memory than reducer.
Now it's only possible to set options for both using mapred.child.java.opts.

Proposed solution: mapred.child.java.opts could be overwritten by mapred.child.map.java.opts or mapred.child.reduce.java.opts. Thus, we're adding more flexibility and compatibility with old configurations.

The same should be done for mapred.child.env.

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