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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-712) TextWritter example is CPU bound!!
Date Mon, 06 Jul 2009 21:57:14 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Owen O'Malley resolved MAPREDUCE-712.
-------------------------------------

    Resolution: Invalid

16 maps on 8 cpus running gzip is expected to completely saturate cpu. This is not a bug!!!

Also check to see if you were using the native codec. If you are using the Java codec, it
will be very slow and cpu bound.

> TextWritter example is CPU bound!!
> ----------------------------------
>
>                 Key: MAPREDUCE-712
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-712
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>    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
>
> Running the RandomTextWritter example job ( from the examples jar) pegs the machiens'
CPUs.

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