Introducing Amazon SNS FIFO – First-In-First-Out Pub/Sub Messaging

When designing a distributed software architecture, it is important to define how services exchange information. For example, the use of asynchronous communication decouples components and simplifies scaling, reducing the impact of changes and making it easier to release new features.
The two most common forms of asynchronous service-to-service communication are message queues and publish/subscribe messaging:
With message queues, messages are stored on the queue until they are processed and deleted by a consumer. On AWS, Amazon Simple Queue Service (SQS) provides a fully managed message queuing service with no administrative overhead.
With pub/sub messaging, a message published to a topic is delivered to all subscribers to the topic. On AWS, Amazon Simple Notification Service (SNS) is a fully managed pub/sub messaging service that enables message delivery to a large number of subscribers. Each subscriber can also set a filter policy to receive only the messages that it cares about.
You can use topics


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