When should you prefer RabbitMQ over Kafka and vice versa?

RabbitMQ and Kafka are message queuing systems, but they have different architectural approaches and use cases.

When to choose RabbitMQ:

• Need complex message routing (queues, topics, routes).
• Support for various protocols (AMQP, MQTT, STOMP).
• Messages should be processed one at a time with acknowledgments (ack), guaranteed delivery is important.
• A system with low latency and small message volumes.
• Easy integration with different languages and platforms.

When to choose Kafka:

• Handling large data streams (logging, analytics).
• High throughput and scalability are important.
• Messages should be stored for a long time for re-reading.
• Support for real-time event processing and building event-driven architecture.
• Ensure message order and the possibility of parallel processing.

Example: if you are building a notification system with different routing logic, RabbitMQ is better. If you need a platform for collecting and analyzing logs with high load — Kafka.