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https://issues.apache.org/jira/browse/PIG-441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633542#action_12633542
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Olga Natkovich commented on PIG-441:
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+1
> Order by desc does not work with more than one reducer
> ------------------------------------------------------
>
> Key: PIG-441
> URL: https://issues.apache.org/jira/browse/PIG-441
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: types_branch
> Reporter: Alan Gates
> Assignee: Alan Gates
> Fix For: types_branch
>
> Attachments: PIG-441.patch
>
>
> Order by with desc works if you use a single reducer. But with more than one
> reducer the partitions are not correctly constructed. The SortParitioner
> uses the object comparators, not the raw the comparators. The object
> comparators have no concept of order by descending. So they build the
> partitions for ascending order. The end result is data sorted descending
> within the partition but not across partitions.
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