51 RabbitMQ interview questions with answers

All RabbitMQ interview questions

• What is RabbitMQ and why would you use it?

• What is AMQP and what problem does it solve?

• Explain the difference between a message broker and direct service-to-service communication.

• What are the main components of RabbitMQ architecture?

• What is a queue in RabbitMQ?

• What is the difference between a producer and a consumer?

• What is a binding in RabbitMQ?

• What is a routing key and how is it used?

• What is the role of exchanges in RabbitMQ?

• Explain connections and channels in RabbitMQ.

• What does "persistence" mean for messages?

• What is acknowledgment (ack) in RabbitMQ?

• What is a virtual host (vhost) in RabbitMQ?

• What happens when a queue has no consumers?

• What is a message in RabbitMQ?

• When should you use message queuing vs direct API calls?

• What are the four main exchange types in RabbitMQ?

• How does a direct exchange work?

• How does a fanout exchange work?

• How does a topic exchange work and when would you use it?

• How does a headers exchange work?

• Can multiple queues bind to the same exchange?

• What happens if you publish a message to an exchange with no bindings?

• What is the difference between topic exchange pattern "user.*" and "user.#"?

• How should you name routing keys and exchange names for clarity?

• What is the difference between an exchange and a queue?

• What is a dead-letter exchange and how would you use it?

• What is prefetch count and how does it affect performance?

• What is message TTL and how would you use it?

• What are priority queues and when would you use them?

• How do you handle message failures and retries in RabbitMQ?

• What is the difference between persistent and transient messages?

• What are publisher confirms and why use them?

• How does RabbitMQ handle backpressure?

• When should you separate producer and consumer connections?

• Explain the work queue (task queue) pattern.

• Explain the publish-subscribe (pub/sub) pattern.

• Explain the RPC (Remote Procedure Call) pattern with RabbitMQ.

• What is the saga pattern and how does it work with RabbitMQ?

• What is the outbox pattern and why use it?

• How do you implement circuit breaker pattern with RabbitMQ?

• What is the relationship between RabbitMQ and event sourcing?

• Explain RabbitMQ clustering and how it provides high availability.

• What are quorum queues and why are they better than mirrored queues?

• How do you monitor RabbitMQ and what metrics matter?

• What is queue depth and how do you handle it growing?

• How do you handle connection and channel leaks in RabbitMQ?

• How do you configure resource limits in RabbitMQ?

• What is the difference between RabbitMQ and Kafka?

• You need to send a reminder email 30 minutes after a user places an order — how do you do it with a message queue?

• What is a poison message? How do you detect and stop one?