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- 1-Adaptive Control Overlay for Service Management

With application systems increasingly built around the services-centric model, management of these eventually large distributed systems of interacting services is a challenge. In contrast to traditional application environments and their related management systems, management of distributed services systems will not have central control and is inherently dynamic. Furthermore, with dependability of services from hosting locations decreasing, services gain flexibility for identifying “best locations” and “appropriate capacity” for satisfying demands. With demands and other conditions changing over time, services may migrate among locations or adapt their capacity in order to keep the system in a desired balance. We propose an architecture and algorithms for a serviceoriented control system that constantly re-evaluates system conditions and re-adjusts service placements and capacities. The control system is organized as an overlay topology with monitoring and actuation interfaces to underlying services. Evaluation of system conditions is performed by distributed control algorithms in the overlay which possess self-organizing capabilities.