On exploring performance optimizations in web service composition

The importance of service composition has been widely recognized in the Internet research community due to its high flexibility in allowing development of customized applications from primitive services in a plug-and-play manner. Although much research in defining architectures, choreography languages and etc, has been conducted, little attention has been paid to composite services' runtime performance-related aspects (e.g., network bandwidths, path delay, machine resources), which are of great importance to wide-area applications, especially those that are resource-consuming. Service composition in the wide area actually creates a new type of routing problem which we call QoS service routing. We study this problem in large networks and provide distributed and scalable routing solutions with various optimization goals. Most importantly, we propose ways to reduce redundancies in data delivery and service execution through explorations of different types of multicast (service multicast and data multicast) in one-to-many application scenarios.