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Date: Fri, 30 Mar 2012 11:06:25 +0000 (UTC)
From: "Ravi Gummadi (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (MAPREDUCE-4087) [Gridmix] GenerateDistCacheData
 job of Gridmix can become slow in some cases
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ravi Gummadi updated MAPREDUCE-4087:
------------------------------------

    Status: Open  (was: Patch Available)
    
> [Gridmix] GenerateDistCacheData job of Gridmix can become slow in some cases
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4087
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4087
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>         Attachments: 4087.patch, 4087.trunk.patch
>
>
> In map() method of GenerateDistCacheData job of Gridmix, val.setSize() is done every time based on the bytes to be written to a distributed cache file. When we try to write data to next distributed cache file in the same map task, the size of random data generated in each iteration can become small based on the particular case. This can make this dist cache data generation slow.

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