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Posted to dev@hive.apache.org by "Carl Steinbach (JIRA)" <ji...@apache.org> on 2010/07/23 18:44:52 UTC
[jira] Updated: (HIVE-432) SORT BY is always sending data to only
the first reducer even if there are multiple reducers
[ https://issues.apache.org/jira/browse/HIVE-432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Carl Steinbach updated HIVE-432:
--------------------------------
Fix Version/s: 0.3.0
> 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
> Fix For: 0.3.0
>
> 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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