It would be really nice if an error would not corrupt the player state. An example which is unfortunately not so theoretical and happens too frequently: player calls handler to buy something for virtual currency Handler adds data to player data * Handler subtract virtual currecncy
As a precaution I always put to the "giving" stuff before the "taking away" stuff, exactly because writing player data and updating currency can and will produce an internal server error, and will leave the player data in a corrupted state, because 1 update operation is executed but the other not. So even a retry is not a correct solution.
It would be nice simple to say for any handler that if any exceptions were thrown during execution, the player state is not updated at all. It would be either all or nothing. This way we could safely retry the call from the game client. Or to define a transaction blocks with "begin" and "end".
