Migration Phases

Migration Phases

In general, the migration process passes through several phases.

• In the initial phase , all the brokers are in ZK mode, and there is a ZK-based controller.
• During the initial metadata load , a KRaft quorum loads the metadata from ZooKeeper,
• In hybrid phase , some brokers are in ZK mode, but there is a KRaft controller.
• In dual-write phase , all brokers are KRaft, but the KRaft controller is continuing to write to ZK.
• When the migration has been finalized , we no longer write metadata to ZooKeeper.