Hello team, we're considering to use Cloud Spanner as main DB because of globally distribution, scale-out features. Although DataHub supports postgreSQL DB as main DB, Cloud Spanner only supports subset of postgreSQL interface, so we are curious that we can use Cloud Spanner as main DB. Could we choice Cloud Spanner as main DB? Or if you know some cases, would you introduce it to us?

Don't know of anyone using Cloud Spanner. It might be possible that it works as Datahub only uses basic PostgreSQL functionality. You'll have to test and let us know.

Thank you for your reply. We'll investigate it more!