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https://issues.apache.org/jira/browse/KAFKA-20697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18089938#comment-18089938
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Muralidhar Basani commented on KAFKA-20697:
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Hi [~mjsax] , I'd like to pick this up if it's still open.
I can add ducktape coverage for these scenarios.
> Add cross-version system tests
> ------------------------------
>
> Key: KAFKA-20697
> URL: https://issues.apache.org/jira/browse/KAFKA-20697
> Project: Kafka
> Issue Type: Sub-task
> Components: streams, system tests
> Reporter: Matthias J. Sax
> Priority: Blocker
> Fix For: 4.4.0
>
>
> With AK 4.4 release, we bump the HB request/response RPCs to `1`, and start
> to send certain fields if both client and server are on version 4.4+.
> To ensure that nothing breaks, we need to test older clients against 4.4+
> brokers, to ensure that no warmup tasks are assigned (an 4.2/4.3 client won't
> report lag information and should never get warmup task assigned) even if
> configured for the group. – We should also think about other compatibility
> scenarios to cover?
> Similarly, we should run a 4.4+ client against 4.2/4.3 brokers, to verify
> that it works as expected. The 4.4+ client should not send a bad request
> which might fail broker side.
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