Dependable Execution of Workflow Activities on a Virtual Private Grid Middleware

The paper relates QoS management to Workflow management and discusses dependable execution on a middleware layer, named Virtual Private Grid (VPG), of sets of processes performing a workflow activity. It proposes two patterns of interaction between a Workflow Management System and the distributed workflow management support. The patterns monitor resource availability & connectivity, and, in case of fault of any resource, ensure job completion by re-mapping a process graph and restarting it. Current implementation of the patterns and of the run-time supportare described.