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https://issues.apache.org/jira/browse/KAFKA-18221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lianet Magrans resolved KAFKA-18221.
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Resolution: Fixed
> Set explicit consumer group protocol in streams tests
> -----------------------------------------------------
>
> Key: KAFKA-18221
> URL: https://issues.apache.org/jira/browse/KAFKA-18221
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Lianet Magrans
> Assignee: Lianet Magrans
> Priority: Major
> Fix For: 4.0.0
>
>
> Currently KS uses the classic group protocol (while KIP-1071 completes). The
> group.protocol config is explicitly set to CLASSIC in the core streams logic
> but not in the streams tests.
> This has been fine because the legacy KafkaConsumer (with classic protocol)
> is the default one, but KS tests will break when the new consumer becomes the
> default one.
> We should explicitly set group.protocol (to "classic" for now) in all stream
> tests that require it to avoid breaking them.
> This gap showed when attempting to make the new consumer/protocol default
> with [https://github.com/apache/kafka/pull/18121] (just an exercise for now,
> to find this kind of gap)
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