Speed up reflection method calls
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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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