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ISSN: 1939-1374
Marin Silic , University of Zagreb, Zagreb
Goran Delac , University of Zagreb, Zagreb
Ivo Krka , University of Southern California, Los Angeles
Sinisa Srbljic , University of Zagreb, Zagreb
The modern information systems on the Internet are often implemented as composite services built from multiple atomic services. These atomic services have their interfaces publicly available while their inner structure is unknown. The quality of the composite service is dependent on both the availability of each atomic service and their appropriate orchestration. In this paper, we present LUCS, a formal model for predicting the availability of atomic web services that enhances the current state-of-the-art models used in service recommendation systems. LUCS estimates the service availability for an ongoing request by considering its similarity to prior requests according to the following dimensions: the user's and service's geographic location, the service load, and the service's computational requirements. In order to evaluate our model, we conducted experiments on services deployed in different regions of the Amazon cloud. For each service, we varied the geographic origin of its incoming requests as well as the request frequency. The evaluation results suggest that our model significantly improves availability prediction when all of the LUCS input parameters are available, reducing the prediction error by 71% compared to the current state-of-the-art.
prediction model, Web services, service availability

M. Silic, G. Delac, I. Krka and S. Srbljic, "Scalable and Accurate Prediction of Availability of Atomic Web Services," in IEEE Transactions on Services Computing.
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