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https://issues.apache.org/jira/browse/PIG-844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich resolved PIG-844.
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accumulate interface took care of this.
> PERFORMANCE: streaming data to the UDFs in foreach
> --------------------------------------------------
>
> Key: PIG-844
> URL: https://issues.apache.org/jira/browse/PIG-844
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
>
> Currently, Pig places the data passed to UDFs into a bag. This can cause the
> process to use more memory than actually needed as in many cases it would be
> better to push the data one tuple at a time to the UDFs.
> For the case where combiner is invoked, this might not be that important;
> however, for non-algebraic UDFs as well as other cases where combiner can't
> be used, this can provide significant memory improvement.
> Another possible use case is where the data is already grouped going into pig
> and we don't need to group it again.
> How this will effect UDF interface needs to be further discussed.
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