KRaft
KRaft is Apache Kafka’s Raft-based metadata-management mode, using an internal controller quorum instead of ZooKeeper.
Kafka for Architects
KRaft is Kafka's metadata management mode that uses an internal controller quorum instead of ZooKeeper.
- How it is used
- Positions KRaft as Kafka’s internal metadata and coordination mode when planning a cluster for production.
- How deep it goes
- Explains controller roles, metadata-log replication, majority commits, and failure handling, but defers step-by-step configuration.
- Examples
- Illustrates majority commit with a metadata-update diagram and quorum loss with a data-center outage scenario.
- What you can do after
- Evaluate/understand controller placement, quorum-loss consequences, and the migration implications of removing ZooKeeper.
Apache Kafka in Action
KRaft is Kafka's protocol for managing cluster metadata and internal coordination without an external coordination system.
- How it is used
- Coordinates Kafka cluster metadata, controller election, partition assignments, and leader changes without a separate ZooKeeper service.
- How deep it goes
- Explains controller roles, failure tolerance, metadata storage, and migration steps, but does not detail Raft’s consensus algorithm.
- Examples
- Uses bank-transfer partitions and one-, three-, and five-controller configurations to illustrate coordination and failure tolerance.
- What you can do after
- Operate/configure it by choosing controller capacity and planning a verified migration from ZooKeeper-backed coordination.
Related concepts
- Raftimplements · Raft is a distributed consensus algorithm that uses leader election and replicated logs to coordinate nodes and maintain consistent replicated state despite failures.
- ZooKeeperalternative to · Apache ZooKeeper is a distributed coordination service that provides shared configuration, naming, synchronization, metadata management, and leader-election primitives.
- controllerimplemented by · A Kafka controller is a server role that manages cluster metadata and coordinates partition, replica, and leader state.
- coordination clusteralternative to · A coordination cluster is a group of nodes that monitors a distributed cluster and manages its membership, metadata, assignments, and coordination state.
- Apache Kafkaconfigures · Apache Kafka is a distributed event-streaming platform for publishing, storing, processing, and consuming streams of records.
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