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https://issues.apache.org/jira/browse/HADOOP-11223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16754347#comment-16754347
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Michael Miller commented on HADOOP-11223:
-----------------------------------------
I submitted a PR https://github.com/apache/hadoop/pull/473
> 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
> Components: conf
> Reporter: Gopal V
> Assignee: Varun Saxena
> Priority: Major
> Labels: Performance
> Attachments: HADOOP-11223.001.patch
>
>
> 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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