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From "Vladimir Klimontovich (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (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, 18 Aug 2010 20:47:29 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Klimontovich resolved MAPREDUCE-2003.
----------------------------------------------

    Resolution: Duplicate

Yep, MAPREDUCE-1207 is exactly the same. Sorry for duplicate bug, closing

> 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) 
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 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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