A method includes receiving a proper subset of messages of a plurality of incoming messages with keys included in a corresponding subset of a plurality of possible keys assigned to the feed receiver module in key assignment data. Messages of the proper subset of messages are maintained. Owned ones of the proper subset of messages having keys included in an owned subset of keys in the corresponding subset, corresponding to keys in the corresponding subset to which the feed receiver module is assigned as an owner in the key assignment data, are identified. Only the owned ones of the proper subset of messages are emitted.