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https://issues.apache.org/jira/browse/HADOOP-11223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769739#comment-16769739
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Michael Miller commented on HADOOP-11223:
-----------------------------------------
{quote}
Michael Miller Sorry to join the party so late, just want to understand how
Accumulo uses this feature, as this is still not read-only config, But surely
benefits you someway. I would like to understand the use case a little better.
Thanks
{quote}
Accumulo currently does not use this feature but it is something that would be
beneficial. We previously had a static class that would save the Configuration
object the first time it was created and then return that object whenever it
was needed. There were a lot of changes internally to eliminate static state
like this and only construct some objects once at startup of the server.
Mainly for performance and concurrency reasons we don't want the Hadoop
Configuration to change or be re-read.
> 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: Michael Miller
> Priority: Major
> Labels: Performance
> Attachments: HADOOP-11223.001.patch, HADOOP-11223.002.patch,
> HADOOP-11223.003.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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