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From "Dmitriy V. Ryaboy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-483) PERFORMANCE: different strategies for large and small order bys
Date Wed, 05 Sep 2012 07:10:08 GMT

     [ https://issues.apache.org/jira/browse/PIG-483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitriy V. Ryaboy updated PIG-483:
----------------------------------

    Assignee: Jie Li
      Status: Patch Available  (was: Open)
    
> PERFORMANCE: different strategies for large and small order bys
> ---------------------------------------------------------------
>
>                 Key: PIG-483
>                 URL: https://issues.apache.org/jira/browse/PIG-483
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Olga Natkovich
>            Assignee: Jie Li
>              Labels: gsoc2011, performance
>         Attachments: PIG-483.0.patch, PIG-483.1.patch
>
>
> Currently pig always does a multi-pass order by where it first determines a distribution
for the keys and then orders in a second pass.  This avoids the necessity of having a single
reducer.  However, in cases where the data is small enough to fit into a single reducer, this
is inefficient.  For small data sets it would be good to realize the small size of the set
and do the order by in a single pass with a single reducer.
> This is a candidate project for Google summer of code 2011. More information about the
program can be found at http://wiki.apache.org/pig/GSoc2011

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