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Posted to mapreduce-dev@hadoop.apache.org by "Vladimir Klimontovich (JIRA)" <ji...@apache.org> on 2010/08/11 14:12:16 UTC

[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)

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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[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)

Posted by "Vladimir Klimontovich (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/MAPREDUCE-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Klimontovich resolved MAPREDUCE-2003.
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    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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