Zookeeper: Intro

This lesson introduces the Zookeeper service.


Zookeeper is a crucial piece of any Big Data deployment at enterprise scale. ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization and group services. All these services are used by distributed applications. According to the official website, Zookeeper gots its name because coordinating distributed systems is a zoo.

At its core, Zookeeper is simple to understand. Think of it as a hierarchical filesystem or a tree. The basic building block of Zookeeper is a znode. A znode can store data (like a file) or have child znodes (like a directory). The overall design of Zookeeper provides for a highly available system consisting of znodes that make up a hierarchical namespace. The following is a representation of znodes:

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