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Posted to dev@hive.apache.org by "jiraposter@reviews.apache.org (JIRA)" <ji...@apache.org> on 2011/08/11 01:32:31 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=13082765#comment-13082765 ]
jiraposter@reviews.apache.org commented on HIVE-2368:
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https://reviews.apache.org/r/1462/
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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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