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From "Luke Lu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7734) metrics2 class names inconsistent between trunk and 20x
Date Tue, 11 Oct 2011 21:03:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125387#comment-13125387
] 

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

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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