US Patent 10467236 Mining association rules in the map-reduce framework

In each iteration of the process of mining association rules from transaction data by a cluster of computing systems, each mapper node in the cluster receives a split of the transaction data. Each mapper node scans the split to count an absolute support value of each candidate itemset for current search level(s), and passes the candidate itemsets and their support values to reducer nodes in the cluster. The number of reducer nodes will be determined adaptively based on the number of the candidate itemsets and the number of maximum available resource nodes in the cluster. Each reducer node combines the absolute support value of each candidate itemset, and finds frequent itemsets among them using a minimum support threshold. For each frequent itemset it finds, the reducer node creates association rule(s) satisfying a minimum confidence threshold, and exports all discovered frequent itemsets and association rules to a file system for storage.