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Class 6 Model-based SHS

Class 6 Model-based SHS. Shang-Wen Cheng zensoul@cs.cmu.edu Apr 2, 2003. Papers. Gross, Gupta, Kaiser, Kc, Parekh (CDSA’01) An Active Events Model for Systems Monitoring . Combs, Vagel (WOSS’02) Adaptive Mirroring of System of Systems Architectures . Bond, Sud (CDSA’01)

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Class 6 Model-based SHS

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  1. Class 6Model-based SHS Shang-Wen Cheng zensoul@cs.cmu.edu Apr 2, 2003

  2. Papers • Gross, Gupta, Kaiser, Kc, Parekh (CDSA’01) • An Active Events Model for Systems Monitoring. • Combs, Vagel (WOSS’02) • Adaptive Mirroring of System of Systems Architectures. • Bond, Sud (CDSA’01) • Service Composition for Enterprise Programming. • How is this related to SHS?

  3. Model-based Self-repair • Main idea • Use some abstraction as basis for problem detection and adaptation • Variations • “Layer” of system • Models used? • Externalized or internalized? • Support multiple control models?

  4. Taxonomy? Model-based adaptation Typically, distributed collaborative applications Models: events, agents, contracts, policy System quality attributes such as performance, reliability, etc. • Application Domains • Networks, Distributed Systems • Mobile Systems • Ubiquitous Computing • Biology Simulation • User Interfaces • Collaborative Computing • Games • Tools, Mechanisms, Techniques • Architectural models • Algorithms/code-based • Formal models • Genetic algorithms/alternative models • Agents • Economic theory • Goals: • Improvesystem performance/Resource usage • Improve user experience; reduce user distractions • Improve dependability

  5. *Four General Requirements for SHS • Monitor:Observe the running system and abstract observed behavior. • Detection:Continuously check constraints via explicit(?) run-time models. • Resolution:Determine the cause of constraint violation and choose a adaptation strategy. • Adaptation:Adapt the system using verified change strategies.

  6. Application domain Distributed system with focus on “monitoring” What’s the model? “Active events” Notion of anomaly and time window Goals Flexibility and Efficiency Mechanism XML & mobile code Monitor: Use system of “probes” to get raw information out Abstract that information using “gauges” Detection: SmartEvent showing anomalous condition Resolution: Is there any? Adaptation: Deploy worklets ActEvents Approach

  7. Application domain Enterprise, distributed applications What’s the model? “Adaptive mirror” & contracts How is this different from an architectural model? Goals Reliability and scalability Mechanism Agents Monitor: Probes & gauges Detection: Constraint directive violation Does “hint” play a part? Resolution: Search of eligible service substitutes Adaptation: Service substitution How does it occur? Adaptive Mirroring Approach

  8. Application domain Enterprise applications, with focus on middleware What’s the model? Enterprise policy Dynamic directory? Goals Reliable & flexible interoperation Mechanism Peers Monitor: Implicit, when peers get service requests Detection: A requested service is unavailable or violates enterprise policy Resolution: Determine where to reroute or request service Adaptation: Reroute service or request service provision ODSI Approach

  9. Shortcomings? • Are models explicit and well-defined? • How “reusable” are the components of the various approaches?

  10. Comments? • The End

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