[VWWHFSfQ]

Isn't that just MongoDB frozen in time before it was re-licensed under SSPL? Or is it actually a completely new query/storage engine that is MongoDB client-compatible?

In any case, I don't really like any of Amazon's homemade databases after the disaster that SimpleDB turned out to be.

[plorkyeran]

DocumentDB an entirely separate implementation built on Amazon's internal tech which just speaks the MongoDB wire protocol. If they use any pre-SSPL MongoDB code it's just incidental bits and pieces.

[spmurrayzzz]

Side note: From my experiences with documentdb, during the fires I had to put out trying to migrate a large mongodb workload to it, it looks like its Postgres or Aurora-Postgres under the hood (based solely on duck-typing around features, identifier constraints, storage limitations, billing, etc)