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https://issues.apache.org/jira/browse/HADOOP-11506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14288439#comment-14288439
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Dmitriy V. Ryaboy commented on HADOOP-11506:
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or I would if this version of JIRA let me edit my previous posts.
> 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
>
> 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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