NSQ

• Source: https://github.com/nsqio/nsq
• License: MIT
• Alternatives: RabbitMQ, Apache Kafka, NATS, Redis Streams
• Status: Replaced by RabbitMQ (MQTT)

Queue service. Allows responding to events in a distributed way — publishers like MinIO don't need to know about subscribers, so you can create N subscribers that respond to file events without changing MinIO.

Features

• Decentralized Architecture: No single broker; each nsqd node operates independently
• At-Least-Once Delivery: Messages guaranteed to be delivered even across restarts
• HTTP & TCP Clients: Publish and consume from any language via simple HTTP or TCP
• Admin UI: Built-in web dashboard for monitoring queues, channels, and consumers
• Horizontal Scaling: Add more nsqd nodes to scale throughput without reconfiguration