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

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merged 2 commits into from
May 16, 2024

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sobychacko
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  • Clarify the usage of the new consumer-group protocol in the 3.7.0 version of the client
  • Add a note on the usage of EmbeddedKafka in kraft mode

* Clarify the usage of the new consumer-group protocol in the 3.7.0 version of the client
* Add a note on the usage of `EmbeddedKafka` in `kraft` mode
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.

When using the `EmbeddedKafka` with the 3.7.0 version of the `kafka-client`, the `kraft` mode is disabeld by default.
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This sentence does not reflect reality.
We have it kraft = false compiled-in. Independently of the Kafka client.

I would suggest to have a dedicated bullet for the Testing Support Changes and explain there why we turned it off.
But I believe that has nothing to do with Kafka client 3.7.0

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ya, i hear your point. I actually thought about it. However, the new consumer-group protocol testing with EmbeddedKafka in kraft mode may still be relevant here. What do you think?

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Well, there is catch 22. The new consumer group protocol works only in KRaft mode.
And unfortunately, only with real broker, not one created by the KafkaClusterTestKit.
Then we also saw some flaws for classic group management in KRaft mode.
So, this or other way kraft mode is not recommended with @EmbeddedKafka.

@artembilan artembilan added this to the 3.2.0 milestone May 16, 2024
@artembilan artembilan merged commit 0eb3462 into spring-projects:main May 16, 2024
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