Why reliability prevents message loss in RabbitMQ - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a durable queue in RabbitMQ.

RabbitMQ

channel.queue_declare(queue='task_queue', durable=[1])

Drag options to blanks, or click blank then click option'

AFalse

B0

CNone

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Setting durable to False causes the queue to be deleted on restart.

Setting durable=True ensures the queue survives RabbitMQ restarts, preventing message loss.

2fill in blank

medium

Complete the code to publish a persistent message to the queue.

RabbitMQ

channel.basic_publish(exchange='', routing_key='task_queue', body=message, properties=pika.BasicProperties(delivery_mode=[1]))

Drag options to blanks, or click blank then click option'

A2

B1

C0

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using delivery_mode=1 sends non-persistent messages that can be lost.

Setting delivery_mode=2 marks the message as persistent, so it is saved to disk.

3fill in blank

hard

Fix the error in the consumer code to acknowledge messages manually.

RabbitMQ

channel.basic_consume(queue='task_queue', on_message_callback=callback, auto_ack=[1])

Drag options to blanks, or click blank then click option'

ANone

BFalse

CTrue

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using auto_ack=True causes messages to be lost if the consumer fails before processing.

Setting auto_ack=False means the consumer must send an acknowledgment after processing, preventing message loss.

4fill in blank

hard

Fill both blanks to declare a durable queue and publish a persistent message.

RabbitMQ

channel.queue_declare(queue='task_queue', durable=[1])
channel.basic_publish(exchange='', routing_key='task_queue', body=message, properties=pika.BasicProperties(delivery_mode=[2]))

Drag options to blanks, or click blank then click option'

ATrue

BFalse

C2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting durable or delivery_mode incorrectly causes messages to be lost on restart.

Durable queues and persistent messages together prevent message loss on RabbitMQ restarts.

5fill in blank

hard

Fill the blanks to consume messages with manual acknowledgment and durable queue.

RabbitMQ

channel.queue_declare(queue='task_queue', durable=[1])
channel.basic_consume(queue='task_queue', on_message_callback=callback, auto_ack=[2])
channel.start_consuming()

Drag options to blanks, or click blank then click option'

ATrue

BFalse

CNone

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using auto_ack=True causes message loss if consumer crashes.

Declaring a durable queue and setting auto_ack=False ensures messages are not lost and are acknowledged manually.