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https://issues.apache.org/jira/browse/PIG-581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pradeep Kamath updated PIG-581:
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Summary: Pig should enable an option to disable the use of combiner
optimizer (was: Pig should enable an option to disable the use of optimizer)
> Pig should enable an option to disable the use of combiner optimizer
> --------------------------------------------------------------------
>
> Key: PIG-581
> URL: https://issues.apache.org/jira/browse/PIG-581
> Project: Pig
> Issue Type: Improvement
> Affects Versions: types_branch
> Reporter: Pradeep Kamath
> Fix For: types_branch
>
>
> There are some cases where a combiner optimization chosen by Pig may actually
> be slower than the non optimized version. For example, the use of combiner to
> address the issue reported in https://issues.apache.org/jira/browse/PIG-580
> could result in slower execution IF the distinct on groups of values does not
> actually shrink those groups. This is however very data dependent and the
> user may know before hand that this might be the case and may wish to disable
> the use of the optimizer. Pig should enable an option to do so.
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