How does ZooKeeper ensure the reliability of data?

ZooKeeper ensures data reliability through the following mechanisms:

1. Data Replication: ZooKeeper employs a multi-replica mechanism to store data, where each data node is replicated on multiple ZooKeeper servers. This ensures that even if one server fails, the data can still be accessed from other servers.
2. Leader election mechanism: ZooKeeper utilizes a leader election process to select one server as the leader, which is responsible for handling client requests. The other servers act as followers, replicating data. This ensures the order and consistency of data operations.
3. Transaction processing: ZooKeeper supports transaction processing. Each data change operation (such as creating, updating, or deleting nodes) is encapsulated as a transaction and processed through the Leader server to ensure data consistency and atomicity.
4. Connection and heartbeat mechanism between client and server: The ZooKeeper client will maintain a long connection with the ZooKeeper server and regularly send heartbeats to check the connection status. If the connection is lost, it will attempt to reconnect to ensure timely updating and synchronization of data.

By utilizing the above mechanism, ZooKeeper can ensure the reliability and consistency of the data, guaranteeing its accuracy and availability.