I think it's great that someone is taking a detailed look at distinct isolation levels for different systems. It's also worth looking at distinct levels for atomicity, consistency, and durability. One could then define an overall "pH" level for systems.

I would take exception to Bailis' statement that "it is impossible to simultaneously achieve high availability and serializability." At FoundationDB, we do exactly that.

Stephen Pimentel

foundationdb.com