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https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125387#comment-13125387
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Luke Lu commented on HADOOP-7734:
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Actually the metrics2 framework is first checked into 20x branch and then some
API evolved for good reasons in trunk and then 0.23, which was explicitly
marked as incompatible changes. I personally don't want to support 0.20x style
plugins and prefer giving a more explicit upgrade message, which is reasonable.
Supporting both would make 0.23/trunk code very ugly.
> 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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