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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6133) ReflectionUtils performance regression
Date Mon, 10 Aug 2009 00:38:14 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-6133:
--------------------------------

    Status: Patch Available  (was: Open)

> ReflectionUtils performance regression
> --------------------------------------
>
>                 Key: HADOOP-6133
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6133
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 0.20.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-6133-0.20.patch, hadoop-6133-trunk.txt, 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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