– How are the data nodes in ZooKeeper modified?

The data nodes of ZooKeeper can be modified by connecting to the ZooKeeper cluster through a client and sending write requests. In ZooKeeper, the data of nodes is stored in data nodes called ZNodes. To modify the data of a ZNode, a client can send a write request, such as creating, updating, or deleting operations, to modify the ZNode’s data.

Specifically, the client can use the API provided by ZooKeeper to create a new ZNode, update the data of an existing ZNode, or delete a ZNode. When the client sends a write request, the leader node in the ZooKeeper cluster will coordinate the processing of this request, ensuring that all ZooKeeper nodes reach a consistent data state. If the write request is successfully processed, ZooKeeper will return a successful response to the client, indicating that the data node has been successfully modified.

It is important to note that ZooKeeper is a distributed system with strong consistency, so after a data node is modified, all clients will be able to see the same data. This ensures that data modifications in ZooKeeper are done in a consistent order, and each node in the entire cluster has the same data view.