▪ Lambda sends the event to a internal queue and returns a success response without any

additional information

▪ Separate process reads events from the queue and runs our lambda function

▪ S3 / SNS + Lambda + DynamoDB

▪ Invocation-type flag should be “Event”

▪ AWS Lambda sets a retry policy

Retry Count = 2

Attach a Dead-Letter Queue (DLQ)

▪ Example of asynchronous invocation using the AWS CLI:

aws lambda invoke —function-name MyLambdaFunction —invocation-type Event —payload '{ "key": "value" }'

▪ Triggered AWS services of asynchronous invocation; S3, EventBridge, SNS, SES,

CloudFormation, CloudWatch Logs, CloudWatch Events, CodeCommi

https://docs.aws.amazon.com/lambda/latest/dg/invocation-async.html