David Arthur created KAFKA-14833:
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Summary: ZK migration cannot start if a ZK controller was not
previously elected
Key: KAFKA-14833
URL: https://issues.apache.org/jira/browse/KAFKA-14833
Project: Kafka
Issue Type: Bug
Components: kraft
Affects Versions: 3.4.0
Reporter: David Arthur
During the BecomeZkController event in KRaftMigrationDriver, an error occurs if
there was not data in the /controller_epoch znode.
{code}
[2023-03-22 14:33:06,082] ERROR Had an exception in BecomeZkControllerEvent
(org.apache.kafka.metadata.migration.KRaftMigrationDriver)
java.lang.IllegalStateException: Cannot register KRaft controller 3001 as the
active controller since there is no ZK controller epoch present.
at
kafka.zk.KafkaZkClient.tryRegisterKRaftControllerAsActiveController(KafkaZkClient.scala:201)
at
kafka.zk.ZkMigrationClient.claimControllerLeadership(ZkMigrationClient.scala:60)
at
org.apache.kafka.metadata.migration.KRaftMigrationDriver.apply(KRaftMigrationDriver.java:143)
at
org.apache.kafka.metadata.migration.KRaftMigrationDriver.access$800(KRaftMigrationDriver.java:57)
at
org.apache.kafka.metadata.migration.KRaftMigrationDriver$BecomeZkControllerEvent.run(KRaftMigrationDriver.java:357)
at
org.apache.kafka.queue.KafkaEventQueue$EventContext.run(KafkaEventQueue.java:121)
at
org.apache.kafka.queue.KafkaEventQueue$EventHandler.handleEvents(KafkaEventQueue.java:201)
at
org.apache.kafka.queue.KafkaEventQueue$EventHandler.run(KafkaEventQueue.java:175)
at java.lang.Thread.run(Thread.java:750)
{code}
This mainly affects tests when we start a KRaft quorum first, and then the
(new) ZK cluster. The migration driver will kick off when the ZK brokers
register but it will race with KafkaController on the /controller_epoch
creation.
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