Message brokers (Kafka, RabbitMQ) in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a message broker in microservices?

A message broker is a software that helps different microservices talk to each other by sending and receiving messages in a safe and organized way.

intermediate

How does Kafka ensure message durability?

Kafka stores messages on disk and replicates them across multiple servers, so messages are safe even if one server fails.

intermediate

What is the main difference between Kafka and RabbitMQ?

Kafka is designed for high-throughput and streaming data with a log-based storage, while RabbitMQ focuses on flexible routing and supports many messaging patterns.

beginner

What is a queue in RabbitMQ?

A queue is a place where messages wait until a microservice is ready to process them, ensuring messages are handled one by one or in order.

beginner

Why use message brokers in microservices architecture?

They help microservices communicate asynchronously, improve system reliability, and allow scaling by decoupling services.

Which feature is Kafka best known for?

A High-throughput and log-based message storage

B Flexible message routing with exchanges

C Built-in message transformation

D Automatic message prioritization

Kafka is designed for high-throughput and stores messages in a log format for streaming.

In RabbitMQ, what is an exchange used for?

A Storing messages permanently

B Compressing messages

C Routing messages to queues based on rules

D Encrypting messages

Exchanges route messages to queues using binding rules.

What does asynchronous communication mean in microservices?

A Services use the same database

B Services wait for each other to respond immediately

C Services communicate only once a day

D Services send messages and continue without waiting

Asynchronous means services send messages and do not wait for immediate replies.

Which of these is NOT a benefit of using message brokers?

A Decoupling microservices

B Forcing synchronous calls

C Improving system reliability

D Enabling scaling

Message brokers enable asynchronous communication, not forcing synchronous calls.

How does RabbitMQ handle message delivery?

A Messages are routed to queues and delivered to consumers

B Messages are stored in topics only

C Messages are deleted immediately after sending

D Messages are broadcast to all services

RabbitMQ routes messages to queues, where consumers receive them.

Explain how Kafka and RabbitMQ differ in their approach to message handling and use cases.

Think about storage style and routing flexibility.

Describe why message brokers are important in a microservices architecture and how they improve system design.

Consider communication style and system robustness.