Kafka vs RabbitMQ, Pulsar & Others

Introduction

What is Kafka Broker Comparisons? Choose Kafka, RabbitMQ, Pulsar, EventBridge, or Kinesis based on replay, ordering, ops burden, and cloud fit.

Understanding the topic

Kafka vs other messaging systems:

• Choose Kafka when you need durable logs, replay, and independent consumer groups at scale.
• Choose RabbitMQ for classic queues and per-message routing when replay is not required.

Visual explanation

Pipeline view:

Producer
  ↓
Topic partition log
  ↓
Consumer group A
  ↓
Consumer group B
Replay is possible because records are retained

Step-by-step explanation

1. Requirements — Replay, ordering, scale.
2. Compare — Kafka vs alternatives.
3. Decide — Document in ADR.
4. Pilot — Prove with one use case.

Execution workflow

Best practices

• Design events around business facts: OrderCreated, PaymentAuthorized, InventoryReserved.
• Pick keys based on ordering and load distribution.
• Document owner, retention, schema, partitions, and consumers for every topic.
• Assume duplicate delivery and build idempotent consumers early.

Common mistakes

• Expecting global ordering across a topic.
• Creating one partition because local demos work.
• Skipping schema governance until multiple teams deploy independently.

Summary

Kafka for durable logs with replay; RabbitMQ for task queues; managed AWS services when ops simplicity matters most.