How does ZooKeeper handle read and write operations on nodes?

ZooKeeper is a distributed coordination service used for handling read and write operations on nodes. In ZooKeeper, node read and write operations are mainly implemented through the ZooKeeper API. Some commonly used node read and write operations include:

1. Create node: Use the create() method in ZooKeeper to create a new node. You can specify the node’s path, data content, node type, and other information when creating the node.
2. Read node data: Use the getData() method of ZooKeeper to retrieve the content of a node. It is possible to listen for changes in the node’s data.
3. Update node data: Use the setData() method in ZooKeeper to update the data of a node. You can specify the new data and the data version number.
4. Delete Node: Use the delete() method in ZooKeeper to remove a node. You can specify the node path and data version number.
5. Check if a node exists: Use the exists() method in ZooKeeper to confirm the existence of a node.

When handling read and write operations on nodes, it is necessary to consider issues such as concurrency and consistency in a distributed environment. ZooKeeper provides consistency mechanisms and transaction processing to ensure that read and write operations on nodes are orderly and consistent. By using ZooKeeper’s node listeners and Watcher mechanisms, real-time monitoring and notifications of node changes can be achieved.