Message TTL (Time To Live) in RabbitMQ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a message TTL of 60000 milliseconds in a queue declaration.

RabbitMQ

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

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

A{'x-expires': 60000}

B{'x-max-length': 60000}

C{'x-message-ttl': 60000}

D{'x-dead-letter-exchange': 'dlx'}

Attempts:

3 left

💡 Hint

Common Mistakes

Using x-expires instead of x-message-ttl sets queue expiration, not message TTL.

Confusing x-max-length with TTL; it limits queue size, not message lifetime.

The x-message-ttl argument sets the TTL for messages in the queue in milliseconds.

2fill in blank

medium

Complete the code to publish a message with a TTL of 30000 milliseconds.

RabbitMQ

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

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

A30

B30000

C'30s'

D'30000'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an integer instead of a string causes the TTL to be ignored.

Using time units like '30s' is invalid; TTL must be milliseconds as string.

The expiration property expects a string representing milliseconds as text.

3fill in blank

hard

Fix the error in the queue declaration to correctly set message TTL to 45000 milliseconds.

RabbitMQ

channel.queue_declare(queue='logs', arguments=[1])

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

A{'x-message-ttl': 45}

B{'x-message-ttl': 45000}

C{'x-message-ttl': '45000'}

D{'x-message-ttl': 450000}

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer for TTL.

Setting TTL to 45 (too short) or 450000 (too long) by mistake.

The x-message-ttl value must be an integer representing milliseconds, not a string.

4fill in blank

hard

Fill both blanks to declare a queue with message TTL of 20000 ms and dead-letter exchange named 'dlx'.

RabbitMQ

channel.queue_declare(queue='orders', arguments=[1])

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A{'x-message-ttl': 20000, 'x-dead-letter-exchange': 'dlx'}

B{}

C{'x-dead-letter-exchange': 'dlx'}

D{'x-message-ttl': 20000}

Attempts:

3 left

💡 Hint

Common Mistakes

Setting only one of the two arguments.

Using empty or incomplete dictionaries.

Both x-message-ttl and x-dead-letter-exchange must be set together in the arguments dictionary.

5fill in blank

hard

Fill all three blanks to publish a persistent message with TTL 15000 ms to exchange 'logs' with routing key 'info'.

RabbitMQ

channel.basic_publish(exchange=[1], routing_key=[2], body='Log entry', properties=pika.BasicProperties(delivery_mode=[3], expiration='15000'))

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

A'logs'

B'info'

C2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using delivery_mode 1 which is non-persistent.

Forgetting quotes around exchange or routing key.

The exchange is 'logs', routing key is 'info', and delivery_mode 2 makes the message persistent.