Let’s explore the Zookeeper’s API for coordination purposes.

Zookeeper’s API is essentially a hierarchical namespace similar to a filesystem.

Chubby also provides a hierarchical namespace, while etcd provides a key-value interface.

In the illustration below, we can see:

  • Every name is a sequence of path elements separated by a slash (/).
  • Every name represents a data node (called znode), which can contain a piece of metadata and children nodes.

For example, the node “/a/b” is considered a child of the node “/a”.

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