Comment by atombender

Pulsar's feature set is amazing, but it looks like a beast to operate? Especially compared to lighter-weight systems like NATS or Redpanda.

You need both Bookkeeper and Pulsar, which are both stateful, and both require ZooKeeper. (You can apparently configure Bookkeeper to use Etcd, not sure about Pulsar.) So three applications, each of which has several types of processes that probably demand a dedicated operator if running on Kubernetes.