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Date: Tue, 13 Feb 2007 11:10:05 -0800 (PST)
From: "Ron Bodkin (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-1017) Optimization: Reduce Overhead from
 ReflectionUtils.newInstance
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     [ https://issues.apache.org/jira/browse/HADOOP-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ron Bodkin updated HADOOP-1017:
-------------------------------

    Attachment: ReflectionUtils.patch.txt

Patch to ReflectionUtils to cache constructors.

> 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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