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As explained in KIP-4, ZooKeeper based APIs have many problems.  For example, there is no way to return a helpful error code if an invalid reassignment is partition is proposed.  Adding new features over time is difficult when external tools can access and overwrite Kafka's internal metadata data structures.  Also, ZooKeeper-based APIs inherently lack security and auditability.

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• REQUEST_TIMED_OUT: if the request timed out.
• NOT_CONTROLLER: if the node we sent the request to was not the controller.INVALID_REPLICA_ASSIGNMENT: if the specified replica assignment was not valid-- for example, if it included negative numbers, repeated numbers, or specified a broker ID that the controller was not aware of.
• UNKNOWN_TOPIC_OR_PARTITION - when a topic/partition doesn't exist or a topic deletion is in progress
• NO_REASSIGNMENT_IN_PROGRESS: If a cancellation was called on a topic/partition which was not in the middle of a reassignment
• CLUSTER_AUTHORIZATION_FAILED: If we didn't have sufficient permission to perform the alteration.

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