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https://issues.apache.org/jira/browse/HIVE-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700856#action_12700856
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Namit Jain commented on HIVE-432:
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+1
looks good - I will start the tests and commit it in both places
> SORT BY is always sending data to only the first reducer even if there are
> multiple reducers
> --------------------------------------------------------------------------------------------
>
> Key: HIVE-432
> URL: https://issues.apache.org/jira/browse/HIVE-432
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Priority: Critical
> Attachments: HIVE-432.1.patch
>
>
> When we generate the ReduceSInkOperator, the partition columns are empty,
> which means all the rows will get a hash value of 0, and they will all go to
> the first reducer.
> In the meanwhile we are fixing this bug, please use "CLUSTER BY" instead of
> "SORT BY" so that the data will get distributed to multiple reducers.
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