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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6133) ReflectionUtils performance regression
Date Wed, 08 Jul 2009 22:07:14 GMT
ReflectionUtils performance regression

                 Key: HADOOP-6133
                 URL: https://issues.apache.org/jira/browse/HADOOP-6133
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
         Attachments: Test.java

HADOOP-4187 introduced extra calls to Class.forName in ReflectionUtils.setConf. This caused
a fairly large performance regression. Attached is a microbenchmark that shows the following
timings (ms) for 100M constructions of new instances:

Explicit construction (new Test): around ~1.6sec
Using Test.class.newInstance: around ~2.6sec
ReflectionUtils on 0.18.3: ~8.0sec
ReflectionUtils on 0.20.0: ~200sec

This illustrates the ~80x slowdown caused by HADOOP-4187.

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