[Artemis2]

CockroachDB is made up of several layers to implement SQL and transactions on top of a distributed key-value store: https://www.cockroachlabs.com/docs/stable/architecture/overv...

TiDB has a similar architecture: https://www.pingcap.com/docs/architecture/

[gigatexal]

The TiDB approach is a lot more like Aurora though as you have much finer grained controls over how many storage and query nodes you have.