For more details on pulsar and comparisons to similar systems see this series of blog posts from a rabbitmq developer.
https://jack-vanlightly.com/blog/2018/10/2/understanding-how...
https://jack-vanlightly.com/blog/2018/10/21/how-to-not-lose-...
https://jack-vanlightly.com/blog/2018/10/25/testing-producer...
https://jack-vanlightly.com/blog/2019/9/4/a-look-at-multi-to...