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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1447) Speed up reflection method calls
Date Thu, 01 Jul 2010 23:35:49 GMT
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


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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