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https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125413#comment-13125413
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Luke Lu commented on HADOOP-7734:
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bq. 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?
Well, backporting to 20x say 206 would break existing plugins in production for
previous 20x releases (203-205 and some previous Y releases). 0.20 to 0.23 is a
considered a major release change and people expect things (especially none
end-user facing stuff like metrics) break a little :) 0.23 already requires
major deployment/config changes, of which metrics is a only a small part.
> 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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