Mirrored queues for redundancy in RabbitMQ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a mirrored queue in RabbitMQ?

A mirrored queue is a queue that is replicated across multiple nodes in a RabbitMQ cluster to ensure messages are not lost if one node fails.

beginner

How do mirrored queues improve message reliability?

They keep copies of the queue on multiple nodes, so if one node crashes, another node still has the messages, preventing data loss.

intermediate

Which RabbitMQ configuration file is used to define mirrored queues policies?

The policies for mirrored queues are set in the RabbitMQ configuration or via the rabbitmqctl command using policy definitions.

intermediate

What is the command to set a policy for mirroring all queues in RabbitMQ?

rabbitmqctl set_policy ha-all ".*" '{"ha-mode":"all"}'

intermediate

What happens if the master node of a mirrored queue fails?

One of the mirrors is promoted to master automatically, so the queue continues working without message loss.

What is the main purpose of mirrored queues in RabbitMQ?

A To encrypt messages

B To speed up message delivery

C To reduce message size

D To replicate queues across nodes for fault tolerance

Mirrored queues replicate queues across nodes to ensure messages are safe if a node fails.

Which command sets a policy to mirror all queues in RabbitMQ?

A rabbitmqctl mirror_queue all

B rabbitmqctl start_mirroring all

C rabbitmqctl set_policy ha-all ".*" '{"ha-mode":"all"}'

D rabbitmqctl enable_ha all

The correct syntax uses set_policy with ha-mode set to all.

If the master node of a mirrored queue fails, what happens next?

A A mirror is promoted to master automatically

B The queue is deleted

C Messages are lost

D The cluster shuts down

RabbitMQ promotes a mirror to master to keep the queue running without message loss.

Mirrored queues help prevent which of the following?

A Unauthorized access

B Message loss during node failure

C Slow network connections

D Message duplication

Mirrored queues replicate messages to avoid loss if a node fails.

Where are mirrored queue policies typically defined?

A In RabbitMQ configuration or via rabbitmqctl

B In the application code

C In the operating system settings

D In the database schema

Policies for mirroring are set in RabbitMQ config or with rabbitmqctl commands.

Explain how mirrored queues provide redundancy in RabbitMQ.

Think about what happens when a node fails.

Describe the steps to enable mirrored queues using RabbitMQ policies.

Focus on the command and policy settings.