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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4946) Make the Reader for sampling TeraSort input multithreaded
Date Thu, 25 Dec 2008 09:54:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Devaraj Das updated HADOOP-4946:

    Attachment: 4946.patch

Straightforward patch. I haven't tested it yet.

> Make the Reader for sampling TeraSort input multithreaded
> ---------------------------------------------------------
>                 Key: HADOOP-4946
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4946
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: examples
>    Affects Versions: 0.19.0
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>             Fix For: 0.21.0
>         Attachments: 4946.patch
> The TeraSort sampler that reads from multiple splits to come up with the partition information
can be made multi-threaded, where multiple threads would read from multiple splits concurrently.
That should lead to better performance and also we could attempt at sampling more records
to arrive at a better partition info.

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