In my last few posts, I have discussed about Druid cluster setup. Zookeeper is required for druid as an external dependency. In my upcoming posts, I will discuss about Apache Kafka which also requires Zookeeper as a dependency.
ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.
For better reliability and high availability of the Zookeeper service, we should set up Zookeeper in cluster mode. In this post, I will discuss how to setup a Zookeeper cluster with 3 nodes.