Ulp. The whole point of the InnoDB engine is that it supports atomic transactions, even over crashes. If you want an unsafe table, there's the ISAM engine, which is faster.
What does "100% compatible to InnoDB" mean here? It's not functionally compatible and it's not disk-file-format compatible.
If that's your definition of atomicity - yes, upscaledb offers atomic operations. If you define atomicity as the "A" in "ACID" then no - BEGIN/COMMIT wrappers are not yet available. Work in progress!
What does "100% compatible to InnoDB" mean here? It's not functionally compatible and it's not disk-file-format compatible.