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In the post-ZK world, cluster membership is integrated with metadata updates.  Brokers cannot continue to be members of the cluster if they cannot receive metadata updates.  While it is still possible for a broker to be partitioned from a particular client, the broker will be removed from the cluster if it is partitioned from the controller.

Broker States

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Offline

When the broker process is in the Offline state, it is either not running at all, or in the process of performing single-node tasks needed to starting up such as initializing the JVM or performing log recovery.

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