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From "Ron Bodkin (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1017) Optimization: Reduce Overhead from ReflectionUtils.newInstance
Date Tue, 13 Feb 2007 19:10:05 GMT
Optimization: Reduce Overhead from ReflectionUtils.newInstance

                 Key: HADOOP-1017
                 URL: https://issues.apache.org/jira/browse/HADOOP-1017
             Project: Hadoop
          Issue Type: Improvement
          Components: util
            Reporter: Ron Bodkin
         Attachments: ReflectionUtils.patch.txt

I found that a significant amount of time on my project was being spent in creating constructors
for each row of data. I dramatically optimized this performance by creating a simple WeakHashMap
to cache constructors by class. For example, in a sample job I find that ReflectionUtils.newInstance
takes 200 ms (2% of total) with the cache enabled, but it uses 900 ms (6% of total) without
the cache.

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