message-queue-knowledge
Message Queue Knowledge Base
Quick reference for message broker operations and advanced messaging patterns. Focuses on broker-level operations — for event-driven patterns, see eda-knowledge.
Broker Comparison
| Feature | RabbitMQ | Apache Kafka | Amazon SQS | Redis Streams |
|---|---|---|---|---|
| Model | Message queue | Event log | Message queue | Event log |
| Ordering | Per-queue FIFO | Per-partition | Best-effort (FIFO available) | Per-stream |
| Retention | Until consumed | Time/size-based | 4-14 days | Memory/size-based |
| Replay | No (once consumed) | Yes (offset seek) | No | Yes (ID-based) |
| Consumer Groups | Competing consumers | Native support | Not built-in | Native (XREADGROUP) |
| Throughput | ~50K msg/s | ~1M msg/s | ~3K msg/s per queue | ~100K msg/s |
| Latency | Sub-millisecond | Low milliseconds | 10-100ms | Sub-millisecond |
| Protocol | AMQP 0-9-1 | Custom (TCP) | HTTP/SQS API | RESP |
| Clustering | Quorum queues | Built-in (ZK/KRaft) | Managed | Redis Cluster |
| Best for | Task queues, RPC | Event streaming, logs | Serverless, AWS-native | Lightweight streaming |
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