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https://issues.apache.org/jira/browse/HIVE-2084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014240#comment-13014240
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Ning Zhang commented on HIVE-2084:
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@Carl, one change (at line 49) in package.jdo is to fix a bug that was not
exposed by the old datanucleus version. Without the change datanucleus will
throw an exception in runtime (FCOMMENT is not a column of COLUMNS table). I
guess the old version of datanucleus didn't check MFieldSchema mapping in
package.jdo, by only retrieving the columns mentioned in the <embedded>
elements. The other changes are to make the legacy mappings to confirm to the
current relational schema (e.g., MFieldSchema.FNAME should be mapped to
COLUMNS.COLUMN_NAME). They currently does not cause any runtime exceptions, but
I guess it's better to fix it proactively if we are sure the relational mapping
is wrong.
> Upgrade datanucleus from 2.0.3 to 2.2.3
> ---------------------------------------
>
> Key: HIVE-2084
> URL: https://issues.apache.org/jira/browse/HIVE-2084
> Project: Hive
> Issue Type: Improvement
> Reporter: Ning Zhang
> Assignee: Ning Zhang
> Attachments: 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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