Pulsar supports multiple regions natively which requires separate Zookeeper clusters for each region to manage the global and local cluster state (ie: replicating messages from DC1 => DC2 but not DC3).
If you dont need/want that, then its just a single ZK cluster as with Kafka or anything else. ZK + Brokers + Bookies = Pulsar.
If you dont need/want that, then its just a single ZK cluster as with Kafka or anything else. ZK + Brokers + Bookies = Pulsar.