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Extending WS-Agreement to support renegotiation of dynamic Grid SLAs

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2 Author(s)
Sharaf, S. ; Sch. of Comput., Univ. of Leeds, Leeds, UK ; Djemame, K.

Grid computing systems need to achieve high levels of Quality of Service (QoS) necessary for enterprise applications in science and industry. A Service Level Agreement (SLA) specification provides a formal method for describing QoS requirements. WS-Agreement is a language and protocol designed for advertising the capabilities of providers and creating agreements based on initial offers, and for monitoring agreement compliance at runtime [2]. The definition of the protocol is very general and allows for the negotiation of QoS in any Web service enabled distributed system. However, the WS-Agreement specification does not contemplate the possibility of changing an agreement at runtime. Therefore, the challenge is to provide extensions of WS-Agreement and its semantics in order to make agreements robust and more long-lived to individual term violations. This paper will show extensions of the WS-Agreement specification to support the dynamic nature of SLAs by allowing the possibility of SLA renegotiation at run time.

Published in:

eChallenges, 2010

Date of Conference:

27-29 Oct. 2010

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