Apache Kafka vs Mosquitto | Unicorn Factories

Overview

Apache Kafka and Eclipse Mosquitto both handle messaging but serve different architectural patterns. Kafka is a distributed event streaming platform optimized for high-throughput, durable event storage. Mosquitto is a lightweight MQTT broker designed for IoT pub/sub messaging.

Feature Comparison

Capability	Apache Kafka	Mosquitto
Protocol	Binary TCP (custom)	MQTT 3.1/3.1.1/5.0
Persistence	Durable log storage	Optional (memory/file)
Scalability	1000+ brokers	Single broker typical
Throughput	Trillions of msgs/day	Thousands of msgs/sec
Consumer Model	Multiple independent consumers	Traditional pub/sub
Message Retention	Configurable (indefinite)	Configurable TTL

When to Choose Apache Kafka

High-throughput event streaming (100K+ msgs/sec)
Need for historical replay and event sourcing
Complex stream processing requirements
Multi-datacenter replication needs
Integration with data lakes and analytics

When to Choose Mosquitto

IoT device communication (MQTT native)
Resource-constrained environments
Simple pub/sub patterns
Edge deployments
Protocol translation to Kafka

Can They Coexist?

Yes - many architectures use Mosquitto at the edge for IoT device communication, with Kafka as the central event streaming backbone.