According to their docs, FoundationDB only provides serializable isolation, so it isn't the same as the others in the post which offer strict serializable isolation (multi-key version of linearizability). Without strong clocks you can't have strict serializablity and scale beyond a single log (but one log can get you pretty damn far). TBH most people probably only need serializable transactions anyway.

https://apple.github.io/foundationdb/developer-guide.html#tr...