Comment by igravious

http://janusgraph.org/

Support for various storage backends:

   - Apache Cassandra®
   - Apache HBase®
   - Google Cloud Bigtable
   - Oracle BerkeleyDB

I don't understand how a database doesn't have its own native store. What exactly does a graph database actually do if it doesn't manage the data fed to it? Same is true for CayleyGraph† https://github.com/cayleygraph/cayley and proabably others.

†Plays well with multiple backend stores:

   - KVs: Bolt, LevelDB
   - NoSQL: MongoDB
   - SQL: PostgreSQL, CockroachDB, MySQL
   - In-memory, ephemeral