The real-world is all about collaboration, intentions and eventually dealing with issues by compensating use-cases for exception handling.

Recent few years, I kept a habit to study a couple of topics and read 5 to 8 technical books per year. Below are the technical books, I have read or plan to read.

Kafka uses Zookeeper for the following:

• Electing a controller. The controller is one of the brokers and is responsible for maintaining the leader/follower relationship for all the partitions. Zookeeper is used to elect a controller, make sure there is only one and elect a new one it if it crashes.
• Cluster membership - which brokers are alive and part of the cluster? this is also managed through ZooKeeper.
• Topic configuration - which topics exist, how many partitions each has, where are the replicas, who is the preferred leader, what configuration overrides are set for each topic.

The real-world is all about collaboration, intentions and eventually dealing with issues by compensating use-cases for exception handling.