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https://issues.apache.org/jira/browse/HADOOP-11506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301691#comment-14301691
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Gera Shegalov commented on HADOOP-11506:
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Thank you, Andrew. I'll wait for a couple of days to see if there are more 
comments before committing.

> Configuration.get() is unnecessarily slow
> -----------------------------------------
>
>                 Key: HADOOP-11506
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11506
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Dmitriy V. Ryaboy
>            Assignee: Gera Shegalov
>         Attachments: HADOOP-11506.001.patch, HADOOP-11506.002.patch, 
> HADOOP-11506.003.patch
>
>
> Profiling several large Hadoop jobs, we discovered that a surprising amount 
> of time was spent inside Configuration.get, more specifically, in regex 
> matching caused by the substituteVars call.



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