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https://issues.apache.org/jira/browse/KAFKA-2169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14538592#comment-14538592
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Jun Rao commented on KAFKA-2169:
--------------------------------

1) By api compatibility, I meant the following. Let's say an application uses a 
third party library that includes a Kafka consumer. Let's say that the third 
party library is built with Kafka 0.8.2 jars. If the api is compatible, the 
application can upgrade to Kafka 0.8.3 with the same third party library w/o 
forcing it to recompile. To test this out, you can get a Kafka 0.8.2 binary 
release, replace everything in libs with the jars in a Kafka 0.8.3 binary 
release (in particular, the new zkclient jar) and see if console consumer in 
Kafka 0.8.2 still works.
3) Commented on the RB. 

> Upgrade to zkclient-0.5
> -----------------------
>
>                 Key: KAFKA-2169
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2169
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8.2.0
>            Reporter: Neha Narkhede
>            Assignee: Parth Brahmbhatt
>            Priority: Critical
>         Attachments: KAFKA-2169.patch, KAFKA-2169.patch
>
>
> zkclient-0.5 is released 
> http://mvnrepository.com/artifact/com.101tec/zkclient/0.5 and has the fix for 
> KAFKA-824



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