Google F1 vs. FoundationDB's SQL Layer
foundationdb.com
foundationdb.com
Perhaps, they want to be Oracle or DB2, that's fine, and I understand that, different market perhaps. But they don't have the credibility those companies do. Even Google's F1 has more credibility because well, because of brand name recognition.
Look at these other DB products I might want to choose, all with available source code: RethinkDB, PostreSQL, Riak, CouchDB, SQLite, MariaDB, MongoDB, Couchbase, Cassandra.
At this point, databases are a bit like operating system, there is no way I am picking a closed source operating system if I have a choice. It is just too critical of a component to be closed under a sealed lid.
Yes they all have different features and maybe FoundationDB does something better, I will still put it last in whatever category, just because I want to be able to look at how it works.
perhaps by open source they mean the collection of clients on Github
You are correct that the FoundationDB storage engine itself (transactional key-value store) is closed-source. (It is free for production use in smaller cluster, and available for license for larger clusters.)
https://foundationdb.com/blog/foundationdb-raises-17-million...
"We all know that Google's stuff is excellent. Now, here's how we're doing the same thing..."