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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2084) Upgrade datanucleus from 2.0.3 to 3.0.1
Date Fri, 19 Jul 2013 03:32:54 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713303#comment-13713303
] 

Edward Capriolo commented on HIVE-2084:
---------------------------------------

I am actually under the option we should branch DN or switch to hibernate. I find it unbelievable
that an object mapping framework is not compatible with itself between versions. What if you
have large databases that can not accept downtime? 
                
> Upgrade datanucleus from 2.0.3 to 3.0.1
> ---------------------------------------
>
>                 Key: HIVE-2084
>                 URL: https://issues.apache.org/jira/browse/HIVE-2084
>             Project: Hive
>          Issue Type: Improvement
>          Components: Metastore
>            Reporter: Ning Zhang
>            Assignee: Sushanth Sowmyan
>              Labels: datanucleus
>         Attachments: ASF.LICENSE.NOT.GRANTED--HIVE-2084.D2397.1.patch, HIVE-2084.1.patch.txt,
HIVE-2084.2.patch.txt, HIVE-2084.D5685.1.patch, HIVE-2084.patch
>
>
> It seems the datanucleus 2.2.3 does a better join in caching. The time it takes to get
the same set of partition objects takes about 1/4 of the time it took for the first time.
While with 2.0.3, it took almost the same amount of time in the second execution. We should
retest the test case mentioned in HIVE-1853, HIVE-1862.

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