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https://issues.apache.org/jira/browse/PIG-1617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912655#action_12912655
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Olga Natkovich commented on PIG-1617:
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Looks good. +1
> 'group all' should always use one reducer
> -----------------------------------------
>
> Key: PIG-1617
> URL: https://issues.apache.org/jira/browse/PIG-1617
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.8.0
> Reporter: Thejas M Nair
> Assignee: Thejas M Nair
> Fix For: 0.8.0
>
> Attachments: PIG-1617.1.patch
>
>
> 'group all' sends all rows to a single reducer, it does not make sense to
> spawn more than one reducer for it. But if higher value of parallelism is
> specified or if the input is large enough so that changes in PIG-1249 result
> in larger value being set, there are additional reducers spawned that don't
> do anything useful.
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