What is the data model of ZooKeeper like?

The data model of ZooKeeper resembles a file system with a hierarchical structure that includes tree-like nodes. Each node can store a small piece of data (referred to as data content) and can also have any number of child nodes.

Each node has a unique path identifier, similar to a path in a file system. The root node is represented as “/”, while the paths of other nodes consist of multiple node names separated by slashes “/”. For example, “/node1/node2” represents a child node named “node2” with a parent node “node1”, and “node1” has the root node “/” as its parent node.

Apart from the data content, each node can also have an attribute called the version number. This number automatically increases when there is a change in the data content of the node, ensuring that update operations are carried out in an orderly manner during concurrent access.

The data model of ZooKeeper also offers additional features, such as a listener mechanism. Clients can register listeners to nodes, and when the data content of a node changes, all registered clients are notified, enabling real-time notifications.

In summary, ZooKeeper’s data model is a simple and flexible hierarchical structure that is well-suited for implementing consistency and coordination mechanisms in distributed systems.