QoS Prediction in Cloud and Service Computing by Yilei Zhang & Michael R. Lyu

Author:Yilei Zhang & Michael R. Lyu
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

4.2 Preliminaries

Figure 4.1 shows the architecture of a typical service-oriented system. Within a service-oriented system, several abstract tasks are combined to implement complicated functions. For each abstract task, an optimal Web service is selected from a set of functionally equivalent service candidates. By composing the selected services, a service-oriented system instance is implemented for task execution. The problem of finding functionally equivalent Web service candidates has been discussed by a lot of previous work [10, 15], which is outside the scope of this work. Typically, the Web service candidates are provided by different organizations and distributed in different geographical locations and time zones. When invoked through communication links, the user-side usage experiences are influenced by the network environments and the server-side status at invocation time. Since service-oriented systems are increasingly running on large numbers of dynamic services, users often encounter highly dynamic and uncertain performance of service-oriented systems.

Fig. 4.2Online performance prediction procedures.

[2014] IEEE. Reprinted, with permission, from Ref. [18]

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