A QoS-Aware and Fault-Tolerant Workflow Composition for Grid

The continuous increasing of computing power in electric system computing places a threshold to the single host use and suggests an approach based on distributed computing. An emerging solution is grid technology, which allows organization to make better use of existing computing resources by providing them with a single, transparent, aggregated source of computing power. New generation of grid infrastructure, where Web services are building blocks, allow management of a Web services workflow. In this paper, a novel strategy - QoS-aware and fault-tolerant workflow composition - has been applied to utilize Web services and business process execution language for overcoming the issues about task assignment, security, flexibility and workflow management. This new strategy is lightweight Web services based computing power-sharing architecture, and it is not only suitable for executing computing works which are able to run in batches, but also be able to solve current issues in Web services based computing application such as system resilience, fault tolerance, efficiency of job scheduling and the instability in congested network environment.