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Date: Thu, 25 Dec 2008 01:54:44 -0800 (PST)
From: "Devaraj Das (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-4946) Make the Reader for sampling TeraSort
 input multithreaded
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     [ 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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