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https://issues.apache.org/jira/browse/KAFKA-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14577563#comment-14577563
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Jun Rao commented on KAFKA-1367:
--------------------------------

Yes, we need some kind of notion of zones for both the brokers and the clients. 
Each broker and each client (producer/consumer) need a configuration for which 
zone it belongs to. It's probably simpler to just return the zone info in TMR. 
We will need to evolve TMR, but that can probably be done separately from 
fixing the ISR in TMR. We probably should move these design discussions to 
KAFKA-2225 itself.

> Broker topic metadata not kept in sync with ZooKeeper
> -----------------------------------------------------
>
>                 Key: KAFKA-1367
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1367
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8.0, 0.8.1
>            Reporter: Ryan Berdeen
>            Assignee: Ashish K Singh
>              Labels: newbie++
>             Fix For: 0.8.3
>
>         Attachments: KAFKA-1367.txt
>
>
> When a broker is restarted, the topic metadata responses from the brokers 
> will be incorrect (different from ZooKeeper) until a preferred replica leader 
> election.
> In the metadata, it looks like leaders are correctly removed from the ISR 
> when a broker disappears, but followers are not. Then, when a broker 
> reappears, the ISR is never updated.
> I used a variation of the Vagrant setup created by Joe Stein to reproduce 
> this with latest from the 0.8.1 branch: 
> https://github.com/also/kafka/commit/dba36a503a5e22ea039df0f9852560b4fb1e067c



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