How does Kafka handle message persistence storage?

Kafka achieves persistent storage of messages by writing them to log files on disk. Each topic has one or more partitions, each with its own corresponding log file where messages are appended. Messages are first written to the log file when sent to Kafka, and then replicated to other nodes through replication mechanisms to ensure their persistence and high availability.

Kafka’s persistence storage is disk-based, ensuring the durability of messages on the disk. After a message is consumed, Kafka retains it for a period of time, allowing consumers to replay messages if needed. By setting various parameters, the persistence strategy of messages, such as retention time and size, can be controlled.

Overall, Kafka provides reliable message delivery service to applications by writing messages to disk log files and ensuring message persistence and high availability through replication mechanisms.