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Date: Tue, 11 Oct 2011 21:45:12 +0000 (UTC)
From: "Luke Lu (Commented) (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-7734) metrics2 class names inconsistent
 between trunk and 20x
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    [ https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125409#comment-13125409 ] 

Luke Lu commented on HADOOP-7734:
---------------------------------

bq. Some examples

For new code (0.23+), the new style (with annotations) API is recommended.

The only two API changes that affect plugins are: 
# Metric -> AbstractMetric because I decide to use Metric for annotation.
# MetricsVisitor method signatures because I didn't understand Java generics very well :)


> 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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