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From "Ron Bodkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1017) Optimization: Reduce Overhead from ReflectionUtils.newInstance
Date Tue, 13 Feb 2007 23:00:10 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12472918
] 

Ron Bodkin commented on HADOOP-1017:
------------------------------------

I'd be glad to remove the public API: I certainly appreciate the desire to avoid that complexity,
or let me know if you'd rather do so. If I do so, I'll make the additional methods package
default access to allow the tests.

> 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, TestReflectionUtils.java
>
>
> 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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