Subscriptions
Subscriptions are a representation of an endpoint and its associated protocol, such as an email address, an SMS phone number, or an AWS Lambda function. When a subscription is created, the topic to which it subscribes sends a confirmation message to the specified endpoint. Once confirmed, the subscription receives all messages published to the topic. Subscriptions can be managed through the AWS Management Console, AWS CLI, or the SNS API. Amazon SNS supports message filtering, allowing you to specify which messages should be delivered to a specific subscription.
Guide: AWS SNS Subscriptions
AWS SNS Subscriptions are a critical part of the Amazon Simple Notification Service (SNS).
Why is it important: They are important as they allow endpoints (email, AWS Lambda, HTTP, SMS, etc.) to subscribe to and receive messages from SNS Topics. This feature allows services to work together in a decoupled manner, improving scalability and reliability.
What is it: An AWS SNS Subscription is a link between an SNS Topic and an endpoint. When a message is published to a Topic, it's delivered to all endpoints subscribed to the Topic.
How It Works: To use SNS Subscriptions, you create a Topic, subscribe an endpoint (using various protocols) to the Topic, then publish messages to the Topic. Subscribed endpoints receive all published messages.
Exam Tips: Note that there are several subscription types, the differences between them, and how to manage them (subscribe, unsubscribe, list). Also, be aware of the 'deliver policy' and 'retry policy' which customize how a message is delivered.
Answering Questions: When answering questions on Subscriptions during the exam, focus on their role in decoupling systems, the options for endpoint types, and the functionality of topics. Remember, messages are stored redundantly across multiple servers and data centers for reliability and durability.
Remember: Failed deliveries do not terminate a subscription.
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