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

    [ https://issues.apache.org/jira/browse/PIG-483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13448536#comment-13448536
] 

Dmitriy V. Ryaboy commented on PIG-483:
---------------------------------------

I think Bill's suggestion is cleaner, but in the spirit of not letting the best be an enemy
of the good -- can we try to get tests to pass with the existing patch Jie wrote?
                
> 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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