Apache Zookeeper is an open-source service that supports controlling a huge set of hosts. Management and coordination in a distributed environment are complex. Zookeeper automates this process and enables developers to concentrate on building software features rather than bother about its distributed nature.
Zookeeper helps to maintain configuration knowledge, naming, group services for distributed applications. It implements various protocols on the cluster so that the application should not execute them on its own. It provides a single coherent view of many machines.
