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https://issues.apache.org/jira/browse/KAFKA-3189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127813#comment-15127813
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Ismael Juma commented on KAFKA-3189:
------------------------------------

Changed the fix version to 0.9.1.0 as it doesn't affect the 0.9.0 branch. The 
aim of KAFKA-2929 was to switch the broker to the Java exceptions. cc 
[~granthenke]

> Kafka server always return UnknownServerException.
> --------------------------------------------------
>
>                 Key: KAFKA-3189
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3189
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>            Reporter: Jiangjie Qin
>             Fix For: 0.9.1.0
>
>
> This issue was introduced in KAFKA-2929. The problem is that we are using 
> o.a.k.common.protocol.Errors.forException() while all exceptions thrown by 
> the broker are still using old scala exception. This cause 
> Errors.forException() always return UnknownServerException.
> We should either switch back to Errors.forException() to 
> ErrorMapping.codeFor() or migrate all the exceptions to Java exception.
> I prefer the latter option since it seems to be a simple class replacement.



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