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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3019) want input sampler & sorted partitioner
Date Mon, 15 Sep 2008 22:41:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-3019:
----------------------------------

    Fix Version/s: 0.19.0
         Assignee: Chris Douglas
           Status: Patch Available  (was: Open)

This won't compile until HADOOP-4151 is in, but marking it PA for review.

> want input sampler & sorted partitioner
> ---------------------------------------
>
>                 Key: HADOOP-3019
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3019
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Doug Cutting
>            Assignee: Chris Douglas
>             Fix For: 0.19.0
>
>         Attachments: 3019-0.patch
>
>
> The input sampler should generate a small, random sample of the input, saved to a file.
> The partitioner should read the sample file and partition keys into relatively even-sized
key-ranges, where the partition numbers correspond to key order.
> Note that when the sampler is used for partitioning, the number of samples required is
proportional to the number of reduce partitions.  10x the intended reducer count should give
good results.

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