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https://issues.apache.org/jira/browse/HIVE-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884488#action_12884488
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Edward Capriolo commented on HIVE-1447:
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Does this have an affect on all generic UDFs? I had someone telling me that
they added one of my genUDF's to a query on a large table and the time to
complete the job went up dramatically.
> 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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