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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1447) Speed up reflection method calls
Date Fri, 02 Jul 2010 00:15:50 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884491#action_12884491

Zheng Shao commented on HIVE-1447:

GenericUDF should not be affected.

GenericUDFBridge is a bridge betwen GenericUDF and UDF.  This patch will fix all problems
for UDF and UDAF.

> Speed up reflection method calls
> --------------------------------
>                 Key: HIVE-1447
>                 URL: https://issues.apache.org/jira/browse/HIVE-1447
>             Project: Hadoop Hive
>          Issue Type: Improvement
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: A.java, HIVE-1447.1.patch
> See http://www.cowtowncoder.com/blog/archives/2010/04/entry_396.html and http://www.jguru.com/faq/view.jsp?EID=246569
> There is a huge drop of overhead (more than half) if we do "field.setAccessible(true)"
for the field that we want to access.
> I did a simple experiment and that worked well with method as well.
> The results are (note that the method just add 1 to an integer):
> {code}
> 100000000 regular method calls:26 milliseconds.
> 100000000 reflective method calls without lookup:4029 milliseconds.
> 100000000 accessible reflective method calls without lookup:1810 milliseconds.
> {code}

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