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https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125394#comment-13125394
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Todd Lipcon commented on HADOOP-7734:
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it's unfortunate that such a new API in 20x is already incompatible with 23...
can't we backport the improvements into 20x as well? What's the point of having
them in 20x if no one can adopt them without breaking in the next version?
> 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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