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https://issues.apache.org/jira/browse/KAFKA-17434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin McCabe resolved KAFKA-17434.
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Fix Version/s: 3.9.0
Resolution: Fixed
> upgrade_test.py tests impossible upgrade scenarios
> --------------------------------------------------
>
> Key: KAFKA-17434
> URL: https://issues.apache.org/jira/browse/KAFKA-17434
> Project: Kafka
> Issue Type: Bug
> Reporter: Colin McCabe
> Assignee: Colin McCabe
> Priority: Major
> Fix For: 3.9.0
>
>
> Because of KIP-902 (Upgrade Zookeeper version to 3.8.2), it is not possible
> to upgrade from a Kafka version earlier than 3.5 to a version later than 3.5.
> Therefore, we should not test these upgrade scenarios in upgrade_test.py.
> They do happen to work sometimes, but only in the trivial case where we don't
> create topics or make changes during the upgrade (which would reveal the ZK
> incompatibility).
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