Grokking the System Design Interview, Volume II
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Controller Broker

A Kafka cluster runs many brokers side by side. A few jobs only make sense with one owner. That owner creates topics, assigns who leads each partition, and notices when a broker has stopped answering. Kafka gives all of that work to a single broker, the controller.

What is the controller broker?

One broker in the cluster is elected the controller. Admin work runs through it: creating or deleting a topic, adding partitions, and assigning each partition's leader.

The controller also watches every other broker's health, checking it on a schedule

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