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ISSN: 1939-1374
Carlos Müller , University of Seville, LSI, Seville
Marc Oriol , Universitat Politècnica de Catalunya (UPC), Barcelona
Xavier Franch , Universitat Politècnica de Catalunya (UPC), Barcelona
Jordi Marco , Universitat Politècnica de Catalunya (UPC), Barcelona
Manuel Resinas , University of Seville, LSI, Seville
Antonio Ruiz-Cortés , University of Seville, LSI, Seville
Marc Rodríguez , Universitat Politècnica de Catalunya (UPC), Barcelona
Service Level Agreements (SLAs) establish the Quality of Service (QoS) agreed between service-based systems consumers and providers. Since the violation of such SLAs may involve penalties, quality assurance techniques have been developed to supervise the SLAs fulfillment at runtime. However, existing proposals present some drawbacks: (1) the SLAs they support are not expressive enough to model real-world scenarios, (2) they couple the monitoring configuration to a given SLA specification, (3) the explanations of the violations are difficult to understand and even potentially inaccurate, (4) some proposals either do not provide an architecture, or present low cohesion within their elements. In this paper, we propose a comprehensive solution, from a conceptual reference model to its design and implementation, that overcomes these drawbacks. The resulting platform, SALMonADA, receives the SLA agreed between the parties as input and reports timely and comprehensive explanations of SLA violations. SALMonADA performs an automated monitoring configuration and it analyses highly expressive SLAs by means of a constraint satisfaction problems based technique. We have evaluated the impact of SALMonADA over the resulting service consumption time performance. The results are satisfactory enough to consider SALMonADA for SLA supervision because of its low intrusiveness.
Quality of Services, Web-based services, Monitors, Testing and Debugging, Software Engineering, Software/Software Engineering, Constraint and logic languages, Language Classifications, Programming Languages Quality assurance, System Management, Management of Computing and Information Systems, Computing Milieux, Solution Monitoring

C. Müller et al., "Comprehensive Explanation of SLA Violations at Runtime," in IEEE Transactions on Services Computing.
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