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Is it also tested against ScyllaDB ? ScyllaDB could be up to 10x performant than Cassandra as backend storage.

Jepsen is not a performance test; we verify safety. I haven't looked at ScyllaDB personally, but you can read about Scylla's own work testing their database here [1], and see some of the issues they found here [2].

[1]: https://www.scylladb.com/2016/02/11/jepsen-testing/

[2]: https://github.com/scylladb/scylla/issues?utf8=%E2%9C%93&q=i...

I never said Jespen is about performance. My comment was only about considering ScyllaDB as backend choice. Thanks for the links anyway.

YugaByte product manager here. The YCQL API which passes Jepsen has its roots in Cassandra Query Language but does not use Cassandra as its backend store. It’s backend store is DocDB, which is a Google Spanner-inspired distributed document store.

Yugabyte doesn't use Cassandra, it's a custom-built database using RocksDB as a key/value layer and with an internal document-store representation.

It offers access to the data in multiple interfaces: Redis, Cassandra CQL and now PostgreSQL.

Thanks for clarification.

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