Grokking Kafka and Event-Driven Architecture
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KRaft and the Controller

Current Kafka makes three promises about how a cluster manages itself. ZooKeeper is gone: "Apache Kafka 4.0 only supports KRaft mode - ZooKeeper mode has been removed." The cluster's records about itself are kept inside Kafka by a small group of servers called controllers. And those controllers keep working as long as a majority of them is alive.

It makes no promise that one process may safely act as both broker and controller in production

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