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Adding more whats-new for kakfa-client 3.7.0 #3253

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May 16, 2024
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Adding more whats-new for kakfa-client 3.7.0 #3253

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Adding more whats-new for kakfa-client 3.7.0
sobychacko May 16, 2024
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Addressing PR review
sobychacko May 16, 2024
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15 changes: 15 additions & 0 deletions spring-kafka-docs/src/main/antora/modules/ROOT/pages/whats-new.adoc
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Expand Up @@ -11,6 +11,21 @@ For changes in earlier version, see xref:appendix/change-history.adoc[Change His
=== Kafka Client Version

This version requires 3.7.0 `kafka-clients`.
The 3.7.0 version of Kafka client introduces the new consumer group protocol.
Fore more details and it's limitations see https://cwiki.apache.org/confluence/display/KAFKA/The+Next+Generation+of+the+Consumer+Rebalance+Protocol+%28KIP-848%29+-+Early+Access+Release+Notes[KIP-848].
The new consumer group protocol is an early access release and not meant to be used in production.
It is only recommended to use for testing purposes in this version.
Therefore, Spring for Apache Kafka supports this new consumer group protocol only to the extent of such testing level support available in the `kafka-client` itself.
By default, Spring for Apache Kafka uses the classic consumer group protocol and when testing the new consumer group protocol, that needs to be opted-in via the `group.protocol` property on the consumer.

[[x32-testing-support-changes]]
=== Testing Support Changes

The `kraft` mode is disabled in `EmbeddedKafka` by default and users wanting to use the `kraft` mode must enable it.
This is due to certain instabilities observed while using `EmbeddedKafka` in `kraft` mode, especially when testing the new consumer group protocol.
The new consumer group protocol is only supported in `kraft` mode and because of this, when testing the new protocol, that needs to be done against a real Kafka cluster and not the one based on the `KafkaClusterTestKit`, which `EmbeddedKafka` is based upon.
In addition, there were some other race conditions observed, while running multiple `KafkaListener` methods with `EmbeddedKafka` in `kraft` mode.
Until these issues are resolved, the `kraft` default on `EmbeddedKafka` will remain as `false`.

[[x32-kafka-streams-iqs-support]]
=== Kafka Streams Interactive Query Support
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