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https://issues.apache.org/jira/browse/HIVE-2368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082765#comment-13082765
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jirapos...@reviews.apache.org commented on HIVE-2368:
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Review request for hive and Paul Yang.


Summary
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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.


This addresses bug HIVE-2368.
    https://issues.apache.org/jira/browse/HIVE-2368


Diffs
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  trunk/metastore/src/java/org/apache/hadoop/hive/metastore/ObjectStore.java 
1156401 

Diff: https://reviews.apache.org/r/1462/diff


Testing
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Thanks,

Sohan



> 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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