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https://issues.apache.org/jira/browse/KAFKA-8509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-8509.
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Resolution: Fixed
> Add downgrade system tests
> --------------------------
>
> Key: KAFKA-8509
> URL: https://issues.apache.org/jira/browse/KAFKA-8509
> Project: Kafka
> Issue Type: Improvement
> Components: system tests
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Major
>
> We've been bitten a few times by downgrade incompatibilities. It should be
> straightforward to adapt our current upgrade system tests to support
> downgrades as well. The basic procedure should be:
> # Roll the cluster with the updated binary, keep IBP on old version
> # Verify produce/consume
> # Roll the cluster with the old binary, keep IBP the same.
> # Verify produce/consume
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