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