Likely extreme mirroring + no keys actually kept on the unit. They just store N byte chunks of data which a master somewhere fetches an decrypts at its leisure would be the best approach. (with key value pairs stored on that said machine).
Best approach not necessarily being the one that was put into production.
The fastest approach would be to store your key value pairs encrypted on the host device, and do your map/reduce functions locally so you only forward relatively useful data.
Best approach not necessarily being the one that was put into production.
The fastest approach would be to store your key value pairs encrypted on the host device, and do your map/reduce functions locally so you only forward relatively useful data.