-- Use PolyBase to load public data from Azure blob storage into the Contoso Retail Data Warehouse schema.

Dino Esposito explains JSON-to-rowset native support in SQL Server 2016 and provides a realistic perspective of data query when you have JSON data stored in the database.

PolyBase, a data virtualization feature for SQL Server, allows users to seamlessly query data from various external sources directly using T-SQL (Transact-SQL) without the need for separate client ...

MS SQL does allow for active-active-passive clsters. I'm no expert so hopefully somone here isso you can get a better idea--or Google active active SQL and see what you find.