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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-432) SORT BY is always sending data to only the first reducer even if there are multiple reducers
Date Sun, 19 Apr 2009 09:45:47 GMT

     [ https://issues.apache.org/jira/browse/HIVE-432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zheng Shao updated HIVE-432:
----------------------------

    Attachment: HIVE-432.1.patch

Can be applied to both trunk and branch 0.3.

> 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
>
> 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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