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Posted to dev@hive.apache.org by "Ning Zhang (Commented) (JIRA)" <ji...@apache.org> on 2011/10/21 01:22:10 UTC

[jira] [Commented] (HIVE-2368) Determining whether a Column Descriptor is unused may take too long

    [ https://issues.apache.org/jira/browse/HIVE-2368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132188#comment-13132188 ] 

Ning Zhang commented on HIVE-2368:
----------------------------------

@Paul Yang, this looks good to me. Can you also review the patch? We'll need this soon. 
                
> Determining whether a Column Descriptor is unused may take too long
> -------------------------------------------------------------------
>
>                 Key: HIVE-2368
>                 URL: https://issues.apache.org/jira/browse/HIVE-2368
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Sohan Jain
>         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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