What’s new in Spring for Apache Kafka 4?

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" summary

Spring Boot 4 + Spring for Apache Kafka 4 migration is shown using OpenRewrite migration to update POMs, starters and tests; embedded Kafka tests are converted away from ZooKeeper. New Kafka queues (share consumers) let many consumers read concurrently from the same partition, with per-message acknowledgements, 30s locks, delivery count, up to five retries and out‑of‑order processing (no ordering guarantee). Limitations: no autoconfig, metrics or tracing yet, no DLQ or batch API. The consumer rebalance protocol "consumer" is opt‑in and demonstrates zero‑downtime rolling upgrades in a live Dockerized demo.

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" chapters (8)

1. 0:00Introduction
2. 1:51Spring Boot 4 and Kafka 4 migration
3. 12:25Kafka queues and shared consumers
4. 23:20Demo: Kafka queues with Spring Kafka
5. 36:33New rebalance protocol in Kafka 4
6. 41:51Demo: Rolling upgrade with new protocol
7. 47:51Trade-offs of new features
8. 49:38Wrap-up and conclusions