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https://issues.apache.org/jira/browse/KAFKA-826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621416#comment-13621416
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Scott Carey commented on KAFKA-826:
-----------------------------------

My main complaint prior to this was two-fold:

* Early versions of metrics 3.x had classpath collisions with 2.2.x , so we 
would be unable to have both in the same application and we already use 2.2.
* There was no official version of metrics 3.x published anywhere to consume, 
no roadmap, and the developer was MIA for months.  Kafka would have had to 
publish their own artifact version which gets messy fast and would have likely 
api compatibility issues with any future final metrics 3.0.x release and 
therefore be very difficult to use kafka 0.8 and the final metrics 3.0 in the 
same application.

If 3.x is stable enough API wise, I'd be fine with keeping kafka on it.   I 
believe 3.x no longer collides with 2.2.x in a classpath, but have not tested 
that recently, meaning we could migrate to 3.x at our own pace and not have to 
time it to be in sync with use of Kafka 0.8.
                
> Make Kafka 0.8 depend on metrics 2.2.0 instead of 3.x
> -----------------------------------------------------
>
>                 Key: KAFKA-826
>                 URL: https://issues.apache.org/jira/browse/KAFKA-826
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8
>            Reporter: Neha Narkhede
>            Assignee: Dragos Manolescu
>            Priority: Blocker
>              Labels: build, kafka-0.8, metrics
>         Attachments: kafka-fix-for-826.patch, kafka-fix-for-826-take2.patch
>
>
> In order to mavenize Kafka 0.8, we have to depend on metrics 2.2.0 since 
> metrics 3.x is a huge change as well as not an officially supported release.

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