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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12053) Stats performance regression caused by HIVE-11786
Date Wed, 14 Oct 2015 13:12:06 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chaoyu Tang updated HIVE-12053:
-------------------------------
    Attachment: HIVE-12053.patch

[~sseth] I provided a patch reverting HIVE-11786 here, please review it. 
Though separating the big query to two parts like that done in getPartition in MetaStoreDirect
may help to mitigate the performance impact in this case, we might have other performance
issues with JDO. So probably we can leave these column stats tables unnormalized at this moment
as a trade-off to the better performance. Thank you for the help.

> Stats performance regression caused by HIVE-11786
> -------------------------------------------------
>
>                 Key: HIVE-12053
>                 URL: https://issues.apache.org/jira/browse/HIVE-12053
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Chaoyu Tang
>            Assignee: Chaoyu Tang
>         Attachments: HIVE-12053.patch
>
>
> HIVE-11786 tried to normalize table TAB_COL_STATS/PART_COL_STATS but caused performance
regression.



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