im not exactly sure about that but i know that at least for integers there are atomic update commands and that for strings there are atomic append commands. so

im not exactly sure about that but i know that at least for integers there are atomic update commands and that for strings there are atomic append commands. so for this you would really just want to do: APPEND foo d or for more complex situations you could do use WATCH instead of MULTI so that you can get the intermediate results. so for your example: WATCH foo GET foo ->value //calculate new_value MULTI SET foo new_value EXEC now if at any other operation (not part of this connection) modifies foo then the transaction will be aborted. GET foo -> value //application logic to update value GETSET foo new_value ->prev then prev will contain the value of foo at the time it was set, so you can then use application logic to roll back or redo the transaction