Kafka vs RabbitMQ, the senior answer

Short summary

Kafka and RabbitMQ solve fundamentally different problems: RabbitMQ is a queue that delivers a message and forgets it, ideal for task-style work where exactly one worker processes a job once. Kafka is an append-only log that retains messages for replay, making it the right choice for event streaming, multiple independent consumers, and reprocessing history. The correct decision starts from the delivery model you need, not throughput benchmarks, and senior engineers often run both in the same system.

• •RabbitMQ = queue + ack: message consumed once then deleted; best for task queues with complex routing
• •Kafka = append-only log with replay; best for event streaming, CDC, and multiple independent consumers
• •Decide on model first, delivery semantics second, benchmarks last — using both in one system is normal

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