RabbitMQ vs Kafka comparison - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

Primary Messaging Model Difference

What is the main difference in the messaging model between RabbitMQ and Kafka?

A RabbitMQ uses a push-based queue system; Kafka uses a pull-based log system.

B RabbitMQ stores messages permanently; Kafka deletes messages immediately after consumption.

C RabbitMQ requires consumers to poll for messages; Kafka pushes messages to consumers.

D RabbitMQ and Kafka both use the same push-based queue system.

💡 Hint

Think about how each system delivers messages to consumers.

RabbitMQ pushes messages to consumers from queues, while Kafka stores messages in logs and consumers pull messages at their own pace.

🧠 Conceptual

intermediate

Message Durability and Retention

Which statement correctly describes message durability and retention differences between RabbitMQ and Kafka?

A RabbitMQ retains messages indefinitely; Kafka deletes messages after consumption.

B Both RabbitMQ and Kafka delete messages immediately after delivery.

C Kafka retains messages based on time or size regardless of consumption; RabbitMQ deletes messages once acknowledged.

D RabbitMQ and Kafka both retain messages permanently until manually deleted.

💡 Hint

Consider how each system handles message storage after consumers read them.

Kafka retains messages for a configured time or size limit even after consumers read them, enabling replay. RabbitMQ deletes messages once consumers acknowledge them.

🔀 Workflow

advanced

Configuring High Availability

Which configuration correctly sets up high availability in RabbitMQ using mirrored queues?

RabbitMQ

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

A rabbitmqctl set_policy ha-all "^" '{"ha-mode":"exactly", "ha-params":2}'

B rabbitmqctl set_policy ha-all "^" '{"ha-mode":"all"}'

C rabbitmqctl set_policy ha-all "^" '{"ha-mode":"nodes"}'

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

💡 Hint

The pattern ".*" matches all queues for mirroring.

The command uses the regex pattern ".*" to match all queues and sets ha-mode to "all" to mirror queues across all nodes.

❓ Troubleshoot

advanced

Diagnosing Kafka Consumer Lag

You notice that Kafka consumers are lagging behind the latest messages. Which is the most likely cause?

A Consumers are too slow or overwhelmed, causing them to fall behind the log end offset.

B Kafka brokers have deleted messages before consumers read them.

C RabbitMQ queues are full, blocking message delivery.

D Producers are sending messages too slowly.

💡 Hint

Lag means consumers are behind the latest messages in Kafka.

Consumer lag happens when consumers cannot keep up with the rate of incoming messages, causing them to fall behind the latest offset.

✅ Best Practice

expert

Choosing Between RabbitMQ and Kafka for Event Streaming

For a system requiring high throughput event streaming with message replay capability, which is the best choice and why?

A RabbitMQ, because it pushes messages immediately and deletes them after consumption for faster processing.

B Kafka, because it stores messages in a durable log allowing replay and handles high throughput efficiently.

C RabbitMQ, because it supports message replay by default through mirrored queues.

D Kafka, because it deletes messages immediately after delivery to save storage.

💡 Hint

Think about replay and throughput capabilities.

Kafka is designed for high throughput and durable log storage, enabling consumers to replay messages. RabbitMQ deletes messages after consumption and is not optimized for replay.