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https://issues.apache.org/jira/browse/HIVE-2368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132188#comment-13132188
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Ning Zhang commented on HIVE-2368:
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@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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