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https://issues.apache.org/jira/browse/MAPREDUCE-336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated MAPREDUCE-336:
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      Resolution: Fixed
    Release Note: 
Allow logging level of map/reduce tasks to be configurable.
Configuration changes:
  add mapred.map.child.log.level
  add mapred.reduce.child.log.level

          Status: Resolved  (was: Patch Available)

I just committed this.

> The logging level of the tasks should be configurable by the job
> ----------------------------------------------------------------
>
>                 Key: MAPREDUCE-336
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-336
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Arun C Murthy
>             Fix For: 0.21.0
>
>         Attachments: MAPREDUCE-336_0_20090818.patch
>
>
> It would be nice to be able to configure the logging level of the Task JVM's 
> separately from the server JVM's. Reducing logging substantially increases 
> performance and reduces the consumption of local disk on the task trackers.

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