How to improve latency between EU-West-2 and EU-North-1

Question

We have a Heroku app that uses EU-West-2 for application dynos (Heroku uses AWS under the hood).

A client wants a database provisioned in EU-North-1, which is not available on Heroku, but we can set this up directly using AWS RDS.

However, this creates immediate latency in the app - when the same RDS setup is provisioned in EU-West-2, it's much quicker.

Is there any way to improve this?

Answer

Depending on your use case, and possible also the database engine, RDS cross-region read-replicas might be useful to you here https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.html#USER_ReadRepl.XRgn

If that's not useful (e.g. because both regions need to be able to write to the database) then it sounds like the kind of thing that something like Global Accelerator could help you with, but I can't find anything in the docs stating that Glocal Accelerator works with RDS (only loadbalancers, EC2, and EIP) https://docs.aws.amazon.com/global-accelerator/latest/dg/work-with-standard-accelerators.html

> Endpoints can be Network Load Balancers, Application Load Balancers, Amazon EC2 instances, or Elastic IP addresses.

I'll leave the idea here anyway, in case in future it can be made to work.

How to improve latency between EU-West-2 and EU-North-1

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