White Papers

Probabilistic QoS and Soft Contracts for Transaction Based Web Services Orchestrations

Category: Software and Web Development, Networking and Communications

Tags: qos

Overview Web services orchestrations and choreographies require establishing Quality of Service (QoS) contracts with the user. This is achieved by performing QoS composition, based on contracts established between the orchestration and the called Web services. These contracts are typically stated in the form of hard guarantees (e.g., response time always less than 5 msec). This paper proposes using soft contracts instead. Soft contracts are characterized by means of probability distributions for QoS parameters. The paper shows how to compose such contracts, to yield a global contract (probabilistic) for the orchestration. The approach is implemented by the TOrQuE tool. Experiments on TOrQuE show that overly pessimistic contracts can be avoided and significant room for safe overbooking exists.

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Publisher: French National Institute for Research in Computer Science and Control
File Format: PDF
Date Published: Aug 4, 2008
Format: White Papers
Topics: Web Services, Quality of Service

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