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https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125431#comment-13125431
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Todd Lipcon commented on HADOOP-7734:
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bq. The only two API changes that affect plugins are:
It's not just sink plugins that are affected, but any applications that want to
build against metrics. For example, HBase is stuck using metrics1 until all of
our users move to 0.23, since we need to support both 20 and 23, and the
metrics2 API is incompatible.
bq. 203-205 and some previous Y releases
Serves them right for developing a major new subsystem on 20 instead of trunk :P
> 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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