Kirk True created KAFKA-17536:
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Summary: Ensure clear error message when "new" consumer used with
incompatible cluster
Key: KAFKA-17536
URL: https://issues.apache.org/jira/browse/KAFKA-17536
Project: Kafka
Issue Type: Improvement
Components: clients, consumer
Affects Versions: 3.9.0
Reporter: Kirk True
Assignee: Kirk True
Fix For: 4.0.0
In Kafka 4.0, by default the consumer uses the updated consumer group protocol
defined in KIP-848. When the consumer is used with a cluster that does not
support (or is not configured to use) the new protocol, the consumer will get
an unfriendly error about unavailable APIs. Since this error could be the
user's first impression when attempting to upgrade to 4.0, we need to make sure
that the error is very clear about the remediation steps (set the
group.protocol to CLASSIC on the client or upgrade and enable the new protocol
on the cluster).
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