ZippyDB is a strongly consistent, geographically distributed key-value DBMS developed internally at Meta.
Key/Value
Tuple-at-a-Time Model
Custom API
N-ary Storage Model (Row/Record)
Shared-Nothing
https://engineering.fb.com/2021/08/06/core-data/zippydb/
Meta
US
2013
Internal / Non-Public
RocksDB, Zookeeper
Proprietary