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Here is a state machine description of the migration.
State | Enum | Description |
MigrationIneligibleZooKeeper | 1 | The cluster is in ZooKeeper mode. The migration cannot yet begin. |
MigrationEligible | 2 | The cluster has been upgraded to a minimum software version and has set the necessary static configs |
MigrationReady | 3 | The KRaft quorum has been started |
MigrationActive | 4 | ZK state has been migrated, controller is in dual-write mode, brokers are being restarted in KRaft mode |
MigrationFinished | 5 | All of the brokers have been restarted in KRaft mode, controller still in dual-write mode |
KRaft | 6 | The cluster is in KRaft mode |
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