[wyuenho]

Well this is pretty much a given isn't it? It's just a SQL implementation. It doesn't say anything about the underlying storage and guarantees. Given that it runs on GFS and Bigtable, unless these tech supports ACID, don't expect Tenzing to be able to support it either. Here's a quote from the paper:

    Tenzing is not ACID compliant - specifically, we are atomic, consistent and
    durable, but do not support isolation.