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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-865) Performance: Unnnecessary computation in FRJoin
Date Fri, 03 Jul 2009 06:22:47 GMT

     [ https://issues.apache.org/jira/browse/PIG-865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan updated PIG-865:
---------------------------------

    Status: Patch Available  (was: Open)

> Performance: Unnnecessary computation in FRJoin
> -----------------------------------------------
>
>                 Key: PIG-865
>                 URL: https://issues.apache.org/jira/browse/PIG-865
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.3.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>            Priority: Minor
>             Fix For: 0.4.0
>
>         Attachments: pig-865.patch, pig-865_v2.patch
>
>
> In POFRJoin implementation POLocalRearrange is used to extract join keys from the input
tuples. If keys match then to perform actual join input tuples are fed to Foreach which does
a cross on its inputs. After keys are extracted using POLocalRearrange output; function getValueTuple(POLocalRearrange
lr, Tuple tuple) is called to reconstruct the input tuple. It seems that this function call
is unnecessary since we already have input tuple at that time. 
> This is not a bug, but since this function would get called for every tuple, if it is
eliminated, it should certainly help to improve performance. 

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