Simple Notification Service
Amazon SNS is a pub-sub system for messaging between systems.
Concepts
- Publishers send messages to topics.
- Topics group related messages, serving as a type.
- Subscribers receive messages from topics.
Queue types
- Standard queues at least once, maybe multiple; best-effort ordering. This is the type that most AWS services support publishing to.
- FIFO queues deliver messages in-order, exactly once. Limited number of transactions; 3,000 per second if using batching, 300 per second otherwise. No SNS. Messages are grouped per consumer, allowing multiple consumers to be added.
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