> - we now have Amazon DocumentDB that is a closed source MongoDB-like scripting interface with Postgres under the hood To clarify, Amazon DocumentDB uses the

> - we now have Amazon DocumentDB that is a closed source MongoDB-like scripting interface with Postgres under the hood To clarify, Amazon DocumentDB uses the Aurora storage engine, which is the same proprietary storage engine that is used by Aurora MySQL and Aurora PostgreSQL, and gives you multi-facility durability by writing 6 copies of your data across 3 facilities, with a 4 of 6 quorum before writes are acknowledged back to the client. So, it's a bit inaccurate to say that DocumentDB has anything to do with Postgres.