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https://issues.apache.org/jira/browse/KAFKA-13570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17468965#comment-17468965
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dengziming commented on KAFKA-13570:
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I don't think it's a simple problem for a Server to properly handle a higher
version RPC from a Client. So it's the responsibility of client to do it, most
Kafka client will fallback to older version RPC on an
UnsupportedVersionException, but it's not granted.
> 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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