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Programming Model Support for Dependable, Elastic Cloud Applications

Programming Model Support for Dependable, Elastic Cloud Applications. Wei-Chiu Chuang , Bo Sang, Charles Killian, Milind Kulkarni. Motivation Elasticity Dependability Implementation Conclusion. Motivation – Cloud in Reality. Motivation -“Ideal” Cloud. Motivation - Failures. Failure!.

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Programming Model Support for Dependable, Elastic Cloud Applications

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  1. Programming Model Support for Dependable, Elastic Cloud Applications Wei-Chiu Chuang, Bo Sang, Charles Killian, MilindKulkarni

  2. Motivation Elasticity Dependability Implementation Conclusion

  3. Motivation – Cloud in Reality

  4. Motivation -“Ideal” Cloud

  5. Motivation - Failures Failure! Single node failure induces global failure recovery

  6. Motivation – Failure in Large Systems Naïve elasticity makes system more likely to fail

  7. Motivation - Too Big To Fail

  8. Motivation Elasticity Dependability Implementation Conclusion

  9. Elasticity – Context Node state X Y Z = 5 e2 e1 e3 = 2 = 4

  10. Elasticity – Independent Contexts Commit in sequential order Node state X Y Z Context 1: x Context 2: y e2 e1 e3 Context 3: z

  11. Elasticity - Hierarchical Contexts e1 global e2 message c’ message message c

  12. Elasticity – Logical Node throughput Demands Distribute contexts to more nodes demand

  13. Elasticity – Logical Node throughput demand

  14. Elasticity – Logical Node throughput Elasticity: change the mapping of contexts to physical nodes demand

  15. Motivation Elasticity Dependability Implementation Conclusion

  16. Partial Recovery Failure recovery is per-context basis Failure! 3 2 1

  17. Event Replay Event replay is safe: outgoing messages is deferred until commit Failure! 3 2 1

  18. Motivation Elasticity Dependability Implementation Conclusion

  19. Head Node Logical node1 Remote nodes interact with head nodes Logical node3 Logical node2

  20. Motivation Elasticity Dependability Implementation Conclusion

  21. Conclusion • Elasticity is crucial for cloud applications. • Our programming model enables elastic execution. • The elastic mechanism also helps fault tolerance. MaceSystems http://www.macesystems.org

  22. Questions?

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