Find the CloudFormation template without SnapStart in this GitHub repository. This application is composed of an Amazon API Gateway endpoint, a Java Lambda function, and an Amazon DynamoDB table. UnicornStockBroker is a sample Serverless application. Using SnapStart with infrastructure as code AWS CloudFormation If you do not modify the mechanism that invokes the Lambda function, or use an unqualified ARN, you cannot take advantage of the optimizations that SnapStart provides. This can either invoke the specific Lambda Version directly or invoke the Lambda alias, which points at the correct Lambda version. Once you have a SnapStart-ready Lambda version, you must change the mechanism that invokes the Lambda function to use a qualified Lambda ARN.
Modify the application or AWS service invoking the Lambda function You can change the Lambda version tied to a Lambda alias without modifying the applications using the Lambda function. While this is optional, creating a Lambda function alias makes the management operations easier. Optionally create a Lambda function aliasĪ Lambda function alias allows you to define a custom pointer, and control which Lambda version it is attached to. For more information, read the Lambda Developer Guide. Therefore, you must enable Lambda versions to use SnapStart. It initializes the function when you publish a new Lambda function version. SnapStart works in conjunction with Lambda function versions. However, there are additional steps to use the SnapStart feature. You activate the SnapStart feature through a Lambda configuration setting. The example described in the launch blog post reduces the cold start duration from over 6 seconds to less than 200ms. Snapstart can significantly reduce the cold start times for Lambda functions written in Java. It shows what happens during a Lambda deployment when SnapStart is enabled, as well as best practices to apply in CI/CD pipelines. This blog post describes in more detail how to enable SnapStart with different infrastructure as code tooling: AWS Serverless Application Model (AWS SAM), AWS CloudFormation, and Terraform. This was written by Michele Ricciardi, Specialist Solutions Architect, DevAx.ĪWS Lambda SnapStart enables customers to reduce cold starts by caching an encrypted snapshot of an initiated Lambda function, and reusing that snapshot for subsequent invocations.
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