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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-563) PERFORMANCE: enable combiner to be called 0 or more times whenver the combiner is used for a pig query
Date Wed, 24 Dec 2008 00:48:44 GMT

     [ https://issues.apache.org/jira/browse/PIG-563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Olga Natkovich updated PIG-563:
-------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

patch committed; thanks, pradeep!

> PERFORMANCE: enable combiner to be called 0 or more times whenver the combiner is used
for a pig query
> ------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-563
>                 URL: https://issues.apache.org/jira/browse/PIG-563
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: types_branch
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>             Fix For: types_branch
>
>         Attachments: PIG-563-v2.patch, PIG-563-v3.patch, PIG-563.patch
>
>
> Currently Pig's use of the combiner assumes the combiner is called exactly once in Hadoop.
With Hadoop 18, the combiner could be called 0, 1 or more times. This issue is to track changes
needed in the CombinerOptimizer visitor and the builtin Algebraic UDFS (SUM, COUNT, MIN, MAX,
AVG) to be able to work in this new model.

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