SEQUENTIAL COOPERATION BETWEEN MAP AND REDUCE PHASES TO IMPROVE DATA LOCALITY

Methods and arrangements for task scheduling. At least one job is assimilated from at least one node, each job comprising at least a map phase and a reduce phase, each of the map and reduce phases comprising at least one task. Progress of a map phase of at least one job is compared with progress of a reduce phase of at least one job. Launching of a task of a reduce phase of at least one job is scheduled in response to progress of the reduce phase of at least one job being less than progress of the map phase of at least one job.