Recovery - Serverless Architectures with AWS Lambda

Recovery

Consider how your serverless application should behave in the event that your functions cannot be executed. For use cases where API Gateway is used as the event source, this can be as simple as gracefully handling error messages and providing a viable, if degraded, user experience until your functions can be successfully executed again.

For asynchronous use cases, it can be very important to still ensure that no function invocations are lost during the outage period. To ensure that all received events are processed after your function has recovered, you should take advantage of dead letter queues and implement how to process events placed on that queue after recovery occurs.