Sounds like foundationdb to some extent. All data is sharded (and replicated) i.e. chunks of the keyspace up to the small blocksize limit are spread across the

Sounds like foundationdb to some extent. All data is sharded (and replicated) i.e. chunks of the keyspace up to the small blocksize limit are spread across the cluster. With this you can scale read throughput with the size of the cluster through parrallel reads. Though their write performance is bounded by the more limited number of transactors, but they still acheive fairly large write scale.