TiKV is an open source distributed Key-Value database which is based on the design of Google Spanner and HBase, but it is much simpler without dependency on any distributed file system. It's has primary features including Geo-Replication, Horizontal scalability, Consistent distributed transactions, Coprocessor support.
https://github.com/pingcap/tikv
https://github.com/pingcap/tikv
PingCAP
2016