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https://issues.apache.org/jira/browse/KAFKA-1811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14243741#comment-14243741
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Gwen Shapira commented on KAFKA-1811:
-------------------------------------

Few notes that may help:

1. We like reviewing with review board. Here's a friendly instruction page on 
how to add the patch to JIRA and RB at once: 
https://cwiki.apache.org/confluence/display/KAFKA/Kafka+patch+review+tool

2. We also like unit tests :)

3. I'd consider pushing this check down to registerBrokerInZk. It seems like a 
natural place to ensure uniqueness of registered brokers before registering. 

4. Another thing to consider is race conditions - what if new broker registers 
while we are checking?
Perhaps we can even use ZK itself to enforce uniqueness?

(Note: I'm not a committer, so those suggestions are not binding. just ideas 
for improvements)



> ensuring registered broker host:port is unique
> ----------------------------------------------
>
>                 Key: KAFKA-1811
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1811
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Jun Rao
>              Labels: newbie
>         Attachments: KAFKA_1811.patch
>
>
> Currently, we expect each of the registered broker to have a unique host:port 
> pair. However, we don't enforce that, which causes various weird problems. It 
> would be useful to ensure this during broker registration.



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