How does ZooKeeper ensure consistency of data?

ZooKeeper ensures data consistency through the following methods:

1. Atomic operation: All write operations in ZooKeeper are atomic, either they succeed or fail, there is no possibility of partial success.
2. Sequential consistency: ZooKeeper ensures that all nodes’ read and write operations are strictly executed in order, meaning if one operation occurs before another operation, their execution order in ZooKeeper will also be consistent.
3. Single view: All clients of ZooKeeper see the same data view, even if the data changes, all clients will see the latest data in a short time.
4. Client session: ZooKeeper uses client sessions to maintain the connection status between clients and servers. Once a client disconnects, its session will be closed to ensure data consistency.

Using these mechanisms, ZooKeeper can ensure data consistency, ensuring the correctness and reliability of data between nodes in a distributed environment.