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Here is a state machine description of the migration.
State | Description |
ZooKeeperMode | The cluster is in ZooKeeper mode |
MigrationEligible | The cluster has been upgraded to a minimum software version and has set the necessary static configs |
MigrationReady | The KRaft quorum has been started |
MigrationActive | ZK state has been migrated, controller is in dual-write mode, brokers are being restarted in KRaft mode |
MigrationFinished | All of the brokers have been restarted in KRaft mode, controller still in dual-write mode |
KRaftMode | The cluster is in KRaft mode |
And a state machine diagram:
Compatibility, Deprecation, and Migration Plan
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