I have an SQS Queue that is subscribed to an SNS Topic and everythning is working as expected. Since I am using Cloudformation for infrastructure provisioning, a few years ago, AWS didn't support RawMessageDelivery via cloudformation, therefore, I had to use a custom resource (lambda) for subscribing our SQS queue to SNS Topic with RawMessageDelivery activated.
Now, cloudformation AWS::SQS::Subscription supports RawMessageDelivery and we can remove the custom resources (lambdas) being used for SNS subscription and use the script below in the template.
MyQueueSubscription:
Type: 'AWS::SNS::Subscription'
Properties:
TopicArn: !Ref TopicArn
Endpoint: !GetAtt
- AbcdEventQueue
- Arn
Protocol: sqs
RawMessageDelivery: 'true'
Now the problem is that custom resource (lambda) that is doing the subscription currently is a separate AWS Stack and if I remove this stack, it will also delete the SQS subscription. Although, I can quickly sync the Queue stack with the code above, however, there's a possibility of losing some messages in this case.
What is the best approach to updating the subscription/stack without losing any messages from the SNS topic to my queue?
