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https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125504#comment-13125504
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Todd Lipcon commented on HADOOP-7734:
-------------------------------------

Is it possible to backport "metrics2.1" in such a way that "metrics2.0" isn't 
broken in the process? I don't know the APIs well enough.
                
> metrics2 class names inconsistent between trunk and 20x
> -------------------------------------------------------
>
>                 Key: HADOOP-7734
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7734
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.20.205.0, 0.23.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>
> The new metrics2 framework was backported into the 20x branch, but the class 
> names differ between the two branches. So, if anyone were to build against 
> the metrics2 API in 20x, it would break when they upgraded to 23. We should 
> reconcile the two so that they are API-compatible.

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