pig-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

View raw message