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https://issues.apache.org/jira/browse/KAFKA-13570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17469134#comment-17469134
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Fredrik Arvidsson commented on KAFKA-13570:
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Would have been nice having such scenario defined in the protocol spec. Maybe
even include supported ApiVersionsRequest versions in the response along side
the error code.
> Fallback of unsupported versions of ApiVersionsRequest and RequestHeader?
> -------------------------------------------------------------------------
>
> Key: KAFKA-13570
> URL: https://issues.apache.org/jira/browse/KAFKA-13570
> Project: Kafka
> Issue Type: Improvement
> Reporter: Fredrik Arvidsson
> Priority: Minor
>
> I've gone through the protocol documentation and the source code, but I can't
> find any explicit documentation stating how clients and brokers are handling
> the scenario when the client sends higher versions of ApiVersionsRequest and
> RequestHeader which the broker doesn't understand. I've seen hints in
> discussions that the broker would fallback to returning version 0 of the
> ApiVersionsResponse in this scenario.
> Are there any documentation that explains these scenarios?
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