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Integration / RabbitMQ Interview Questions

What is the difference between durable and transient queues?

Durability is a property of the queue's metadata, not of the messages inside it, which is a common source of confusion.

Durable QueueTransient Queue
Definition survives a broker restart.Definition is lost when the broker restarts.
Declared with durable=true.Declared with durable=false (the default in most clients).
Still needs persistent messages to keep message bodies across a restart.Any messages inside are gone on restart regardless of delivery mode.

In other words, a durable queue with non-persistent messages will still exist after a restart, but it will be empty - the queue survived, the messages did not.

Durability is a property of:
A durable queue holding only non-persistent messages, after a restart, will be:

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