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From "Vladimir Klimontovich (JIRA)" <j...@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)
Date Wed, 11 Aug 2010 12:12:17 GMT
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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