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https://issues.apache.org/jira/browse/PIG-282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849280#action_12849280
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Alan Gates commented on PIG-282:
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This JIRA refers to map->reduce partitioning. Output partitioning of spraying
to directories based on a key can be done now via a custom store function.
> Custom Partitioner
> ------------------
>
> Key: PIG-282
> URL: https://issues.apache.org/jira/browse/PIG-282
> Project: Pig
> Issue Type: New Feature
> Reporter: Amir Youssefi
> Priority: Minor
>
> By adding custom partitioner we can give control over which output partition
> a key (/value) goes to. We can add keywords to language e.g.
> PARTITION BY UDF(...)
> or a similar syntax. UDF returns a number between 0 and n-1 where n is number
> of output partitions.
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