Cluster computing system and method for automatically generating extracting patterns from operational logs

A proces for generating regular expresions (regexes) as extraction paterns in a cluster computing system includes: receiving log events, a set of seed words, and a set of seed patterns; determining whether the set of seed words is full; if not, generating a new patterns by iteratively adding new patterns whose pattern scores S, surpass a first preset score into the set of seed paterns; selecting a subset of seed patterns from the set of seed patterns; determining whether the subset of seed patterns is empty if not, generating a subset of seed words whose word scores S2 surpass a second preset score and iteratively adding the subset of seed words into the set of seed words; and repeating the above steps until the set of seed patterns is finally pruning the set of seed pattern