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https://issues.apache.org/jira/browse/PIG-865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates updated PIG-865:
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Status: Open (was: Patch Available)
When I ran PigMix_2 (which does FR join) on this patch it actually slowed it
down about 10%.
> 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
> 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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