July 2017
Beginner to intermediate
358 pages
10h 54m
English
Content preview from Building Microservices with Go
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NATS.io
NATS.io is an open source messaging system written in Go, and it has the ability to perform two roles, such as at-most-once and at-least-once delivery. Lets look at what they mean:
- At-most-once delivery: In the basic mode, NATS can act as a Pub/Sub router, where listening clients can subscribe to message topics and have new messages pushed to them. If a message has no subscriber, then it is sent to /dev/null and is not stored internally in the system.
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At-least-once delivery: When a higher level of service and more stringent delivery guarantees are required, NATS can operate in at-least-once delivery mode. In this mode, NATS can no longer function as a standalone entity and needs to be backed by a storage device, which at present ...
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