ScyllaDB

ScyllaDB is the database for data-intensive apps that require high performance and low latency. It was designed to be compatible with Apache Cassandra while achieving significantly higher throughputs and lower latencies.

Scylla uses a sharded design on each node, meaning that each CPU core handles a different subset of data. Cores do not share data, but rather communicate explicitly when they need to. Scylla claims that this design allows much better performance on modern NUMA SMP machines, and scales very well with the number of cores. A 2017 benchmark from Samsung observed the 10x speedup on high-end machines - the Samsung benchmark reported that Scylla outperformed Cassandra on a cluster of 24-core machines by a margin of 10–37x depending on the YCSB workload.

Scylla is free and open source, and is available as either an on-premises solution, on the major public cloud providers or as a DBaaS (Scylla Cloud).