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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6133) ReflectionUtils performance regression
Date Wed, 24 Feb 2010 23:01:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838062#action_12838062
] 

Allen Wittenauer commented on HADOOP-6133:
------------------------------------------

Anyone know off hand what branch this was committed to and can set the 'fix version' field?


> 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, 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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