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Grokking the AWS Certified Solutions Architect – Professional

Build Idempotent Order Processor with Lambda, DynamoDB, and SQS

Takes 90 mins

In applications, a user’s action can sometimes be processed more than once due to accidental double-clicks, network retries, or system failures that trigger the same request multiple times. This Cloud Lab teaches you how to build a reliable order processing system that avoids this problem. You’ll learn about idempotency, which ensures that even if an action is repeated multiple times, the outcome remains the same as if performed only once. For example, clicking the “Place Order” button several times will still create just one order.

In this Cloud Lab, you’ll build an idempotent order processor using key AWS services. To help you get started, this Cloud Lab includes preconfigured resources, as mentioned below:

  • AWS Lambda: Handles the business logic, such as processing and saving orders.

  • Amazon DynamoDB: Stores and retrieves order information as a fast, reliable database.

  • Amazon SQS: Configure Amazon SQS as a message queuing service to manage a high volume of orders, ensuring they are processed smoothly and reliably.

Idempotent order processing pipeline
Idempotent order processing pipeline

You’ll add special checks to DynamoDB to stop duplicate orders. You will also update the Lambda code to check if the incoming order data is correct, send important reports to CloudWatch so you can see how your system is working, and even track the different steps an order goes through. Finally, you’ll connect to Amazon SQS for handling many orders smoothly.

By the end of this Cloud Lab, you will have gained practical skills to build strong and dependable cloud applications. You will understand how to prevent duplicate data, check inputs, monitor your services, manage order statuses, and build systems that can handle several requests without issues.