Message durability and persistence in RabbitMQ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does message durability mean in RabbitMQ?

Message durability means that messages are saved to disk so they are not lost if the RabbitMQ server crashes or restarts.

beginner

How do you make a queue durable in RabbitMQ?

You set the queue property 'durable' to true when declaring the queue. This makes the queue survive server restarts.

intermediate

What is the difference between a durable queue and a persistent message?

A durable queue survives server restarts, but messages must also be marked persistent to be saved to disk and survive restarts.

beginner

How do you mark a message as persistent in RabbitMQ?

When publishing a message, set the property 'delivery_mode' to 2. This marks the message as persistent.

intermediate

Does marking a message as persistent guarantee it is never lost?

No. It reduces the chance of loss by saving to disk, but messages can still be lost if RabbitMQ crashes before writing to disk.

What must be true for a message to survive a RabbitMQ server restart?

A The queue is durable and the message is persistent

B The queue is exclusive

C The message is transient

D The queue is auto-delete

Only durable queues combined with persistent messages ensure messages survive server restarts.

How do you declare a durable queue in RabbitMQ?

A Set 'durable' to true when declaring the queue

B Set 'auto_delete' to true

C Set 'exclusive' to true

D Set 'delivery_mode' to 2

The 'durable' flag makes the queue survive server restarts.

Which delivery_mode value marks a message as persistent?

A 1

B 2

C 0

D 3

delivery_mode=2 marks the message as persistent.

If a queue is durable but messages are not persistent, what happens on server restart?

A Messages are saved but queue is lost

B Messages and queue are lost

C Messages are lost but queue remains

D Both messages and queue survive

Durable queues survive, but non-persistent messages do not.

Which of these is NOT a guarantee of message durability?

A Messages are saved to disk

B Messages survive server crashes

C Queues survive server restarts

D Messages are never lost under any condition

Message durability reduces loss risk but does not guarantee zero loss in all cases.

Explain how to ensure messages are not lost when RabbitMQ restarts.

Think about queue and message settings that affect saving to disk.

Describe the difference between durable queues and persistent messages in RabbitMQ.

One is about the queue, the other about the message.