What difficulties have you had with Zookeeper and Kafka? Zookeeper can be difficult mostly because developers don't understand it very well. But in the case of

What difficulties have you had with Zookeeper and Kafka? Zookeeper can be difficult mostly because developers don't understand it very well. But in the case of Pulsar/BookKeeper/Kafka the usage of Zookeeper is very minimal so it's main problem constraint (performance) is mostly mitigated. Availability and management wise Zookeeper 3.5+ is actually pretty great. You do need to understand dynamic ensemble management but really it's a small price to pay for it's rock solid nature. Stuff like etcd is getting close these days but it took 3 protocol versions and tons of bugs, performance and scalability problems for it to get close to ZK.