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AWS Serverless: Understanding and Managing Lambda Recursive Loops for Event-Driven Architectures using AWS SAM!
- This article demonstrates how to validate a Lambda Recursive Loop Configuration using AWS SAM for managing event-driven architectures.
- A Lambda recursive loop scenario is created to showcase the configurations that help detect and prevent such loops in an event-driven architecture.
- The Lambda recursive loop refers to a scenario where a Lambda function is invoked recursively, creating a kind of infinite loop. It's similar to a do-while loop without an exit condition.
- AWS started supporting Lambda recursive loop configurations in July 2023, enabling the detection and prevention of recursive loops in your Lambda functions.
- This feature is enabled by default and supported by services like Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), and Amazon Simple Storage Service (S3).
- Configurations like budget monitoring, function invocation monitoring, and CloudWatch alarms can be used as alternative guardrails when disabling the Lambda recursive loop feature.
- The deployment of SQS queue and lambda function event mapping is demonstrated using AWS SAM.
- Custom monitoring for recursive invocations can be set up by observing the Lambda function invocations, specifically the RecursiveInvocationsDropped metric.
- AWS will send an email and notification via the Health Dashboard when a recursive loop is detected.
- To avoid resource usage, the Lambda function, SQS Queue, and any new roles created during the process must be deleted once the exercise is completed.
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