Gopal V created HADOOP-11223:
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Summary: Offer a read-only conf alternative to new Configuration()
Key: HADOOP-11223
URL: https://issues.apache.org/jira/browse/HADOOP-11223
Project: Hadoop Common
Issue Type: Bug
Reporter: Gopal V
new Configuration() is called from several static blocks across Hadoop.
This is incredibly inefficient, since each one of those involves primarily XML
parsing at a point where the JIT won't be triggered & interpreter mode is
essentially forced on the JVM.
The alternate solution would be to offer a {{Configuration::getDefault()}}
alternative which disallows any modifications.
At the very least, such a method would need to be called from
# org.apache.hadoop.io.nativeio.NativeIO::<clinit>()
# org.apache.hadoop.security.SecurityUtil::<clinit>()
# org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider::<clinit>
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