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NATS is a purely pub/sub system. It has no persistence or messaging queuing semantics outside of a "queue group" which is a simple round robin delivery of messages sent to a topic.

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Note: There is NATS streaming [1] which implements persistence and redelivery.

[1]: http://nats.io/documentation/streaming/nats-streaming-intro/

[2]: https://github.com/nats-io/nats-streaming-server

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