AWS Lambda Performance Series — Part#2 An Analysis of Async Lambda Fail Retry Behaviour and Dead…
Turgay Çelik

AWS Async Lambda functions can be retried in case of a failure, so you always have to develop your functions to be idempotent.

The important point for us was to be sure that failed lambda calls are always retried. And we also want to measure retry duration gaps and Dead Letter Queue addition delay.