How to subscribe an SQS FIFO queue to a standard SNS topic?

Question

Several different questions have been asked on how to subscribe an SQS FIFO queue to an SNS topic and their answers were " it's impossible " or, more recently, " it's now possible using an SNS FIFO topic ".

This question is a bit more specific in its premises:

• Using an SNS FIFO topic is not a viable option, it has to be a "standard" topic
• Using a "standard" SQS queue is not a viable option, it has to be a FIFO queue

As of time of writing, AWS does not support a direct subscription.

How to achieve it in the next best way possible? Using an AWS Lambda? EventBridge?

Answer 1

As you said, this is currently not possible through direct subscription. A work around to achieve that is to subscribe a lambda to the standard topic and have that lambda sending to the FIFO Queue. It's not ideal since it adds an extra hop, but it does unblock your use-case