SNS Paris Throttling compared to other regions

Question

We are experiencing major throttling issues with SNS in Paris. Compared with Frankfurt and Virginia, where we might see a couple, but are quickly resolved with the retries we have in place. Same application code in all three, same retry policies everywhere.

We noticed this issue a while back, and originally came to the conclusion that it was because Paris has a much lower quota on publish API calls than the other two. We increased it to more than Frankfurt, it still has the same issue.

It's a regular SNS topic, so the only quota we see if the number of publishes per second. Regardless, our other regions have more than Paris, and this continues non-stop.

From Step Functions we see this error:
Rate exceeded (Service: AmazonSNS; Status Code: 400; Error Code: Throttling; Request ID:; Proxy: null)

What else is there to look at other than just bombarding the SNS topic with retires? That we have two other regions operating fine makes it much harder to track down.

Jimmy Dahlqvist · Answer

Hi.

I would start by checking the `ResourceCount ` for SNS in CloudWatch it will give you `The number of messages published to your Amazon SNS topics across your AWS account` it should give you an indication if you are close to the quota. Make sure to check the [Service Quotas console](https://console.aws.amazon.com/servicequotas/home) to verify that the quota has been increased as you have requested.
Other than that, make sure you implement you retries with exponential backoff to not have the retries overload the topic as well.

Hope it helps.

SNS Paris Throttling compared to other regions

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