Riak doesn't have atomic updates. This if_not_modified does not gives you any guaranties. Best way to handle with simultaneously updates is try to engineer scheme so that only one client makes concurrent updates and in case of conflict any sibling will be good for you. Another option is try to use convergent data types [0][1] [0] https://github.com/basho/riak_dt [1] https://github.com/mochi/statebox_riak
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