Scaling up SLA monitoring in pervasive environments

ABSTRACT

Service level agreements (SLA) are contracts defining the obligations and rights between the provider of a web service and a client with respect to the service's quality. An essential component of SLA management is the run-time checking of relevant quality parameters. SLA checking must be precise and continuous to timely detect any possible SLA violations. Available techniques and mechanisms to check SLAs, however, are unlikely to scale to more complex families of SLAs tailored to fit diverse and very large groups of clients whose devices have limited storage and bandwidth capabilities. This challenge results not only in the commitment of valuable resources to SLA checking (reducing the service provider capacity), but it can also trigger additional violations and cause disagreements between client and server due to perceived violations. In this paper we focus on the elaboration of this challenge and on identifying opportunities that arise from the inherent diversity present in scenarios rendering web services in pervasive environments.

REFERENCES

• 1: Plastic project. http://www.ist-plastic.org, 2006.
• 2: B. Abrahao, V. Almeida, J. Almeida, A. Zhang, D. Beyer, and F. Safai. Self-Adaptive SLA-Driven Capacity Management for Internet Services. In Proc. of Network Operations and Management Symposium (NOMS 2006), pages 557--568, 2006.
• 3: Luciano Baresi , Carlo Ghezzi , Sam Guinea, Smart monitors for composed services, Proceedings of the 2nd international conference on Service oriented computing, November 15-19, 2004, New York, NY, USA [doi>10.1145/1035167.1035195]
• 4: A. Dan , D. Davis , R. Kearney , A. Keller , R. King , D. Kuebler , H. Ludwig , M. Polan , M. Spreitzer , A. Youssef, Web services on demand: WSLA-driven automated management, IBM Systems Journal, v.43 n.1, p.136-158, January 2004
• 5: C. Dumitrescu, I. Foster, and I. Raicu. A scalability and performance evaluation of a usage sla-based broker in large grid environments. Technical report, iVDGL/GriPhyN TechReport, 2005.
• 6: Alexander Lazovik , Marco Aiello , Mike Papazoglou, Associating assertions with business processes and monitoring their execution, Proceedings of the 2nd international conference on Service oriented computing, November 15-19, 2004, New York, NY, USA [doi>10.1145/1035167.1035182]
• 7: Zheng Li , Yan Jin , Jun Han, A Runtime Monitoring and Validation Framework for Web Service Interactions, Proceedings of the Australian Software Engineering Conference, p.70-79, April 18-21, 2006 [doi>10.1109/ASWEC.2006.6]
• 8: Heiko Ludwig , Asit Dan , Robert Kearney, Cremona: an architecture and library for creation and monitoring of WS-agreents, Proceedings of the 2nd international conference on Service oriented computing, November 15-19, 2004, New York, NY, USA [doi>10.1145/1035167.1035178]
• 9: Heiko Ludwig , Alexander Keller , Asit Dan , Richard King , Richard Franck, A Service Level Agreement Language for Dynamic Electronic Services, Electronic Commerce Research, v.3 n.1-2, p.43-59, January-April 2003 [doi>10.1023/A:1021525310424]
• 10: Daniel A. Menascé, Automatic QoS Control, IEEE Internet Computing, v.7 n.1, p.92-95, January 2003 [doi>10.1109/MIC.2003.1167347]
• 11: G. Morgan, S. Parkin, C. Molina-Jimenez, and J. Skene. Monitoring middleware for service level agreements in heterogeneous environments. In Proc. 5th IFIP Conf. on e-Commerce, e-Business, and e-Government (I3E 2005), Poznan, Poland, October 26--28, IFIP Volume 189, pages 79--93. IFIP, 2005.
• 12: A. Sahai, A. Durante, and V. Machiraju. Towards automated SLA management for web services. Technical Report HPL-2001-310R1, Hewlett Packard Laboratories, 2002.
• 13: G. Spanoudakis and K. Mahbub. Non intrusive monitoring of service based systems. Int. J. of Cooperative Information Systems, 15(3):325--358, 2006.
• 14: B. Verheecke, M. Cibrán, and V. Jonckers. Aspect-oriented programming for dynamic web service monitoring and selection. In Web Services, European Conference, ECOWS 2004, Erfurt, Germany, September 27--30, 2004, Proceedings, volume 3250 of Lecture Notes in Computer Science, pages 15--29. Springer, 2004.