Abstract: In some implementations, a computer may during a repeating interval in a local GCAC node: (a) receiving and storing key data from one or more other GCAC nodes, the key data indicative of resource usage data for each key in the respective one or more other GCAC nodes wherein each key is associated with an allocation limit equal to a number of resources it may use at any given time across all GCAC nodes; (b) storing current key data, the current key data indicative of the resource usage data for each key in the local GCAC node; (c) determining estimated network-wide key data, the estimated network-wide key data indicative of an estimated network-wide resource usage across all GCAC nodes for each key, the estimated network-wide key data based on a combination of the current key data for the local GCAC node and a weighted multiple of the key data in each of the one or more other GCAC nodes; (d) storing the estimated network-wide key data for each key; and (e) repeating steps (a)-(d) during each interval.