Methods and computer storage media for clustering nodes are provided. An input file is received that is comprised of primary nodes, secondary nodes and metrics that relate to the association between the primary nodes and the secondary nodes. Upon receiving the input file, the input file is abridged to reduce the number of nodes contained in the input file. The unique initial primary nodes are then clustered with their associated secondary node. The clusters containing the unique initial primary nodes are replaced if a subsequent related cluster satisfies a pre-defined condition. In some embodiments, multiple clusters are then merged until the cluster size reaches a pre-defined size. In some embodiments, the input file is cleaned and sorted prior to being abridged.