AWS Lambda durable functions now supports custom Durable Execution SDK

Starting today, AWS Lambda durable functions allows you to bring your own Durable Execution SDK, so you can build durable workflows on any managed or custom runtime supported by Lambda. You can use the existing Durable Execution SDKs available in Node.js, Python, Java, and C#/.NET or author your own SDK in the programming language of your choice. AWS Lambda also released the open-source AWS Durable Execution Conformance Tests, a language-agnostic test suite for validating custom durable execution SDK implementations.

Lambda durable functions lets you write long-running, fault-tolerant workflows directly in your Lambda function code, with built-in checkpointing, automatic retries, and executions that run for up to one year, without managing infrastructure. Previously, if your organization required a specific runtime version or if your team built in a language without a managed Lambda runtime, you were limited to the specific managed versions that durable functions supported. Now you can use any Lambda-supported runtime version or package your own runtime using Amazon Linux 2023. When authoring your own durable execution SDK, the conformance test suite validates your implementation by deploying your functions, invoking them, and validating the execution history against expected behavior.

These capabilities are available in all AWS Regions where Lambda durable functions are available. To get started, see Lambda durable functions documentation and Lambda custom runtime documentation.