THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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| MBean name | Description |
|---|---|
| kafka.server:type=KafkaServer,name=MigrationStateMetadataType | An enumeration of the possible migration states the broker is in: ZooKeeper (1), Dual (2), KRaft (3). Each broker reports this. All migration states except "MigrationReady" are able to be reported by the brokers. |
| kafka.controller:type=KafkaController,name=MigrationState | An enumeration of the possible migration states the cluster can be in. This is only reported by the active controller. The "ZooKeeper" and "MigrationEligible" states are reported by the ZK controller, while the remaining states are reported by the KRaft controller. |
| kafka.controller:type=KafkaController,name=ZooKeeperWriteBehindLag | The amount of lag in records that ZooKeeper is behind relative to the highest committed record in the metadata log. This metric will only be reported by the active KRaft controller. |
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Here is a state machine description of the migration.
State | Enum | Description |
ZooKeeper | 1 | The cluster is in ZooKeeper mode |
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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