[rubiquity]

It is possible that the person I replied to could be talking about an entirely different piece of software. Another reason is that the specifics of the system I'm referring to are not public knowledge.

The more important takeaway is that building on top of MySQL/InnoDB is perfectly fine and that is what I tried to emphasize.

[offbyone]

Especially if it's the one I'm thinking of, too. It's a damn solid architecture.