Consumer prefetch optimization in RabbitMQ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the prefetch count to 10 for a RabbitMQ channel.

RabbitMQ

channel.basic_qos(prefetch_count=[1])

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

A0

B20

C10

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Setting prefetch_count to 0 disables prefetching, which may overload the consumer.

Setting prefetch_count to 10 limits the consumer to receive only 10 unacknowledged messages at a time, optimizing resource usage.

2fill in blank

medium

Complete the code to enable manual message acknowledgments in the consumer.

RabbitMQ

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

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

ATrue

BFalse

CNone

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using True disables manual acknowledgments and prefetch control.

Setting auto_ack to False means the consumer must manually acknowledge messages, allowing better control and prefetch optimization.

3fill in blank

hard

Fix the error in setting prefetch count to limit unacknowledged messages to 5.

RabbitMQ

channel.basic_qos(prefetch_count=[1])

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

A5

BNone

C-5

D'5'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer causes a type error.

The prefetch_count must be an integer. Using a string or negative number causes errors.

4fill in blank

hard

Fill both blanks to set prefetch count to 20 and disable global prefetch.

RabbitMQ

channel.basic_qos(prefetch_count=[1], global=[2])

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

A20

BTrue

CFalse

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Setting global to True applies prefetch count globally, not per consumer.

Setting prefetch_count to 20 limits unacknowledged messages to 20 per consumer. Setting global to False applies this limit per consumer, not globally.

5fill in blank

hard

Fill all three blanks to create a consumer with prefetch count 15, manual ack, and queue named 'jobs'.

RabbitMQ

channel.basic_qos(prefetch_count=[1])
channel.basic_consume(queue=[2], on_message_callback=callback, auto_ack=[3])

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

A15

B'jobs'

CFalse

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using True for auto_ack disables manual acknowledgments.

This setup limits unacknowledged messages to 15, consumes from the 'jobs' queue, and requires manual acknowledgments for better control.