Heterogeneous Grid Workflow Management Based on Virtual Service

Heterogeneous grid workflow management plays an important role in the grid interoperation. It integrates service resources from different grid systems and packs them as atomic services into a composite service. The focuses of the research are how to shield the difference among the heterogeneous grid services and how to provide a flexible way to compose services. Heterogeneous grid workflow management mechanism, based on virtual service, compiles with BPEL4WS standards and shields the differences in the aspects of both organization of service information and the types of service among heterogeneous grids. The mechanism compensates for the weakness that traditional mechanism requires prior static binding in the service selection and scheduling. The proposed mechanism can provide some new functions like service backup and dynamic service selection based on QoS to improve the flexibility and stability of workflow management. In addition, in order to address the issues of tight coupling between data and service, the proposed mechanism employs virtual data space and corresponding data transferring solution.