Web services and incerta spiriti: a game theoretic approach to uncertainty
ECSQARU'11 Proceedings of the 11th European conference on Symbolic and quantitative approaches to reasoning with uncertainty
Orchestrating unreliable services: strategic and probabilistic approaches to reliability
TGC'11 Proceedings of the 6th international conference on Trustworthy Global Computing
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Unreliability is a characteristic feature of web and grid based computation: a call to a web or grid site may or may not succeed. An orchestration manager aims to control web or grid behaviour by constructing dynamic threads which acquire and utilise appropriate resources. For example, in an orchestration, a site may be called and may fail to respond after a period of time. Subsequently, the site may be recalled, or an alternative site may be utilised. In this paper approaches to estimating the reliability and cost of complex orchestrations are proposed. It is assumed that information about site reliability can be accessed from empirically acquired information.