I'm guessing that the pain points surrounded having to set up a Zookeeper cluster in conjunction with Pulsar. I think Pulsar has the best model of the various queuing systems at the moment for the routing flexibility of RabbitMQ, the high-throughput of Kafka (topic/partitions), as well as the ability to seamlessly integrate with cold storage (S3/GCS) and to recall messages from cold storage without extra code (unlike Kafka), I just wish that ZK wasn't an additional dependency.

Anyone know of any Pulsar hosting providers?