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Maybe I missed this in the link but I didn't see how one of the common problems in a distributed application is addressed:

* A POST request is redirected to the primary data source, the resource is created and the id is returned

* A GET request is immediately issued for that id but the resource that has not been replicated to the regional data source

* :boom:

The article touches on this "create-and-redirect-to-show" pattern at the end of the "It's not actually magic" section. https://fly.io/blog/run-ordinary-rails-apps-globally/#it-s-n...

Our Rails gem pins requests to the primary region until the data is replicated.