1. A computer program product, the computer program product comprising: a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code, when executed by at least one processor of a computer, is configured to perform: creating a processing data set of records, wherein each of the records contains data specific to a sub-task from a set of actual sub-tasks and contains a reference to data shared by the set of actual sub-tasks, and wherein a number of the records is equivalent to a number of the actual sub-tasks in the set of actual sub-tasks; with each mapper in a set of mappers, receiving one of the records of the processing data set, wherein the data specific to the sub-task is a leading-index sequence of a local search sequence, and wherein the data shared by the set of actual sub-tasks includes common-index predictors and a matrix; generating a common-index sequence using the common predictors; performing sweep operations on the matrix based on the leading-index sequence; and performing sweep operations on the resulting matrix based on the common-index sequence to identify a local regression model; and with a single reducer, reducing the local regression model from each mapper in the set of mappers to determine a global regression model.