What’s New in Apache Kafka 3.3

Apache Kafka 3.3 introduces KRaft mode as production ready for newly created clusters, replacing ZooKeeper-based metadata management to improve scalability, resilience, and deployment simplicity, while a planned 3.5 bridge release is intended to support migration from ZooKeeper mode. The release also improves KRaft upgrades, controller-quorum observability, metadata replication monitoring, replica safety during shutdown, and administrative access to cluster and disk information. Producer and consumer enhancements include a more balanced sticky partitioner, multi-group offset fetching, delegation tokens for other users, log-recovery metrics, and options supporting exactly-once offset queries. Kafka Streams gains finer-grained source and sink throughput metrics, topology pause and resume controls, simplified processing APIs, and faster permanent shutdown behavior, while Kafka Connect adds exactly-once support for source connectors through atomic record and offset writes and safeguards against zombie tasks.

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