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https://issues.apache.org/jira/browse/KAFKA-3100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098314#comment-15098314
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Ismael Juma commented on KAFKA-3100:
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After some thought, it makes more sense to update the upgrade notes once the
rack information is added (and this is mentioned in the KIP).
> Broker.createBroker should work if json is version > 2, but still compatible
> ----------------------------------------------------------------------------
>
> Key: KAFKA-3100
> URL: https://issues.apache.org/jira/browse/KAFKA-3100
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 0.9.0.0
> Reporter: Ismael Juma
> Assignee: Ismael Juma
> Fix For: 0.9.0.1
>
>
> Description from Jun:
> In 0.9.0.0, the old consumer reads broker info directly from ZK and the code
> throws an exception if the version in json is not 1 or 2. This old consumer
> will break when we upgrade the broker json to version 3 in ZK in 0.9.1, which
> will be an issue. We overlooked this issue in 0.9.0.0. The easiest fix is
> probably not to check the version in ZkUtils.getBrokerInfo().
> This way, as long as we are only adding new fields in broker json, we can
> preserve the compatibility.
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