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Date: Sun, 19 Apr 2009 03:37:47 -0700 (PDT)
From: "Zheng Shao (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Commented: (HIVE-432) SORT BY is always sending data to only
 the first reducer even if there are multiple reducers
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    [ https://issues.apache.org/jira/browse/HIVE-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700575#action_12700575 ] 

Zheng Shao commented on HIVE-432:
---------------------------------

A test on our cluster showed the patch fixed the problem.


> 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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