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https://issues.apache.org/jira/browse/MAPREDUCE-712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736194#action_12736194
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Khaled Elmeleegy commented on MAPREDUCE-712:
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I tested the patch on the same configuration I used before. It improved things.
Using chukwa, this disk is now the bottleneck. However, the cpu is still
~60%-70% busy.
> RandomTextWriter example is CPU bound
> -------------------------------------
>
> Key: MAPREDUCE-712
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-712
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: examples
> Affects Versions: 0.20.1, 0.21.0
> Environment: ~200 nodes cluster
> Each node has the following configuration:
> Processors: 2 x Xeon L5420 2.50GHz (8 cores) - Harpertown C0, 64-bit,
> quad-core (8 CPUs)
> 4 Disks
> 16 GB RAM
> Linux 2.6
> Hadoop version: trunk
> Reporter: Khaled Elmeleegy
> Assignee: Chris Douglas
> Attachments: MR712-0.patch, MR712-1.patch
>
>
> Running the RandomTextWritter example job ( from the examples jar) pegs the
> machiens' CPUs.
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