BrokerChange Controller Event

BrokerChange is a controller event that transition the KafkaController to ControllerChange state.

BrokerChange is enqueued exclusively when BrokerChangeHandler is notified about a new or updated node under /brokers/ids path in Zookeeper (handleChildChange).

When processed (on the controller-event-thread), KafkaController is requested to processBrokerChange (that in turn starts controller election).

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