Apache Kafka 4.0 Drops ZooKeeper: A Practical Guide to KRaft Reconfiguration for Java Developers
By
Eleftheria Drosopoulou
Summary
Apache Kafka 4.0, released March 18, 2025, completely removes ZooKeeper support, making KRaft (Kafka Raft) the sole consensus mechanism. This article explains what Java developers need to know about reconfiguring their Kafka deployments — covering the transition from ZooKeeper-based metadata management to KRaft's self-managed quorum, configuration changes, operational implications, and practical migration steps. It details the removal of ZooKeeper properties, introduction of KRaft-specific configurations like `process.roles` and `node.id`, changes to controller election, and the new metadata log architecture.
Source
bskyApache Kafka 4.0 Drops ZooKeeper: A Practical Guide to KRaft Reconfiguration for Java Developersjavacodegeeks.comKey quotes
· 3 pulledFor over a decade, running Apache Kafka in production meant running two distributed systems simultaneously.
Apache Kafka 4.0 shipped with ZooKeeper support completely removed — not deprecated, not optional, removed.
That era ended on March 18, 2025.
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