Chapter

Grids and Service-Oriented Architectures for Service Level Agreements

pp 45-55

Date:

Distributed Trust Management for Validating SLA Choreographies

  • Irfan Ul HaqAffiliated withDepartment of Knowledge and Business Engineering, University of Vienna
  • , Rehab AlnemrAffiliated withHasso Plattner Institute, Potsdam University
  • , Adrian PaschkeAffiliated withInstitute of Computer Science, Freie University Berlin
  • , Erich SchikutaAffiliated withDepartment of Knowledge and Business Engineering, University of Vienna
  • , Harold BoleyAffiliated withInstitute of Information Technology, National Research Council
  • , Christoph MeinelAffiliated withHasso Plattner Institute, Potsdam University

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Abstract

For business workflow automation in a service-enriched environment such as a grid or a cloud, services scattered across heterogeneous Virtual Organizations (VOs) can be aggregated in a producer-consumer manner, building hierarchical structures of added value. In order to preserve the supply chain, the Service Level Agreements (SLAs) corresponding to the underlying choreography of services should also be incrementally aggregated. This cross-VO hierarchical SLA aggregation requires validation, for which a distributed trust system becomes a prerequisite. Elaborating our previous work on rule-based SLA validation, we propose a hybrid distributed trust model. This new model is based on Public Key Infrastructure (PKI) and reputation-based trust systems. It helps preventing SLA violations by identifying violation-prone services at service selection stage and actively contributes in breach management at the time of penalty enforcement.