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Date: Tue, 25 Oct 2011 20:16:33 +0000 (UTC)
From: "Paul Yang (Commented) (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2368) Slow dropping of partitions caused
 by full listing of storage descriptors
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    [ https://issues.apache.org/jira/browse/HIVE-2368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13135387#comment-13135387 ] 

Paul Yang commented on HIVE-2368:
---------------------------------

Committed. Thanks Sohan!
                
> Slow dropping of partitions caused by full listing of storage descriptors
> -------------------------------------------------------------------------
>
>                 Key: HIVE-2368
>                 URL: https://issues.apache.org/jira/browse/HIVE-2368
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Sohan Jain
>            Assignee: Sohan Jain
>             Fix For: 0.9.0
>
>         Attachments: HIVE-2368.1.patch
>
>
> To determine if a column descriptor is unused, we call listStorageDescriptorsWithCD(), which may return a big list of SDs.  This can severely slow down dropping partitions.
> We can add a maximum number of SDs to return, and just ask for 1 SD, since we are just doing an existential check.

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