Map/reduce approach has been popular in order to compute huge volumes of data since Google implemented its platform on Google distributed File Systems (GFS) and then Amazon Web Service (AWS) provides its services with Apache Hadoop platform. Map/reduce motivates to redesign and convert the existing sequential algorithms to map/reduce algorithms for big data so that the paper presents market basket analysis algorithm with map/reduce, one of popular data mining algorithms. The algorithm is to sort data set and to convert it to (key and value) pair to fit with map/reduce.