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https://issues.apache.org/jira/browse/KAFKA-13029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajini Sivaram resolved KAFKA-13029.
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Resolution: Fixed
> FindCoordinators batching can break consumers during rolling upgrade
> --------------------------------------------------------------------
>
> Key: KAFKA-13029
> URL: https://issues.apache.org/jira/browse/KAFKA-13029
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Priority: Blocker
> Fix For: 3.0.0
>
>
> The changes made under KIP-699 assume that it is always safe to use unbatched
> mode since we move from batched to unbatched and cache the value forever in
> clients if a broker doesn't support batching. During rolling upgrade, if a
> request is sent to an older broker, we move from batched to unbatched mode.
> The consumer (admin client as well I think) disables batching and future
> requests to upgraded brokers will fail because we attempt to use unbatched
> requests with a newer version of the request.
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