ReflectionUtils performance regression
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Key: HADOOP-6133
URL: https://issues.apache.org/jira/browse/HADOOP-6133
Project: Hadoop Common
Issue Type: Improvement
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Attachments: 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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