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https://issues.apache.org/jira/browse/HIVE-490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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He Yongqiang updated HIVE-490:
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Attachment: hive-490-2009-05-23-2.patch
Added a comment to explain that hive will automatically find out the number of
reducers by setting this propery to -1.
> set mapred.reduce.tasks to -1 in hive-default.xml
> -------------------------------------------------
>
> Key: HIVE-490
> URL: https://issues.apache.org/jira/browse/HIVE-490
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Clients
> Reporter: Joydeep Sen Sarma
> Attachments: hive-490-2009-05-23-2.patch, hive-490-2009-05-23.patch
>
>
> this is profoundly irritating. we can estimate reducers. but since
> hadoop-default.xml sets this to '1' - by default we don't. if we expect most
> users to set this to -1 - then we might as well set it to -1 ourselves.
> to not shoot ourselves in the foot - we might want to cap number of reducers
> based on cluster size (like 2*Nodes).
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