What is the method for persisting kafka messages?
There are several methods for persisting Kafka messages.
- Log files: Kafka uses log files to store messages. Each topic has one or more partitions, each partition has a corresponding log file for sequentially writing and appending messages. By writing messages to log files, Kafka can ensure message persistence and order.
- Partitioning: Kafka divides each topic into multiple partitions, each of which can be replicated on different servers. Replication provides fault tolerance and improves availability. When a server fails, Kafka can select a replica as the new leader to ensure message persistence.
- Traditional storage: Kafka can also store messages in traditional storage systems such as file systems, databases, or object storage. By using Kafka Connect tool, messages can be exported from Kafka topics to external storage systems and re-imported into Kafka when needed.
- Durability guarantee: Kafka offers various message delivery semantics, including at-least-once delivery and at-most-once delivery. These semantics can ensure reliable delivery of messages between sender and receiver, and guarantee that messages will not be lost or duplicated.
In general, Kafka achieves message persistence by implementing mechanisms such as log files, partitions, replication, and durability guarantees. These mechanisms ensure the reliability, orderliness, and recoverability of messages.
