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Posted to dev@pig.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2016/11/10 18:53:58 UTC
[jira] [Updated] (PIG-865) Performance: Unnnecessary computation in
FRJoin
[ https://issues.apache.org/jira/browse/PIG-865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rohini Palaniswamy updated PIG-865:
-----------------------------------
Labels: Perfo (was: )
> 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
> Labels: Performance
> 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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