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1. Background & Motivation Handling Overload Evaluation Summary & Future Work 1 of 22 slides Highly Available Publish/Subscribe DEBS 2006 Zbigniew Jerzak, Christof Fetzer Dresden University of Technology Monday 3rd July, 2006 {Zbigniew.Jerzak, Christof.Fetzer}@tu-dresden.de Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

2. Background & Motivation Handling Overload Evaluation Summary & Future Work 2 of 22 slides Motivation Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

5. Background & Motivation Handling Overload Evaluation Summary & Future Work 2 of 22 slides Motivation Priorities? Congestion? Self-optimization? Flexibility? Fairness? Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

6. Background & Motivation Handling Overload Evaluation Summary & Future Work 3 of 22 slides Transient Congestion Eﬀect Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

7. Background & Motivation Handling Overload Evaluation Summary & Future Work 4 of 22 slides Vicious Cycle Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

11. Background & Motivation Handling Overload Evaluation Summary & Future Work 5 of 22 slides Pub/Sub Invariants [EFGK03] Space Decoupling Time Decoupling Synchronisation Decoupling Acyclic/Cyclic graph network topology Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

12. Background & Motivation Handling Overload Evaluation Summary & Future Work 6 of 22 slides Solution Sketch Priorities — value based approach Congestion — load shedding (spanning tree) Self-optimization — dynamically adapt to load Flexibility — no ﬁxed classes/priorities Fairness — approach based on market economy No violation of decoupling properties Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

13. Background & Motivation Handling Overload Evaluation Summary & Future Work 6 of 22 slides Solution Sketch Priorities — value based approach Congestion — load shedding (spanning tree) Self-optimization — dynamically adapt to load Flexibility — no ﬁxed classes/priorities Fairness — approach based on market economy No violation of decoupling properties Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

14. Background & Motivation Handling Overload Evaluation Summary & Future Work 7 of 22 slides Subscription Routing Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

17. Background & Motivation Handling Overload Evaluation Summary & Future Work 8 of 22 slides Subscription Routing summary Each subscription piggybacks client assigned value (Priorities, Flexibility) Values are aggregated along with subscriptions Small memory footprint and minimal bandwidth overhead Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

18. Background & Motivation Handling Overload Evaluation Summary & Future Work 9 of 22 slides Publication Forwarding — No Congestion/Overload Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

19. Background & Motivation Handling Overload Evaluation Summary & Future Work 10 of 22 slides Publication Forwarding — Link Overload Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

23. Background & Motivation Handling Overload Evaluation Summary & Future Work 11 of 22 slides Publication Forwarding — Router Overload Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

27. Background & Motivation Handling Overload Evaluation Summary & Future Work 12 of 22 slides Publication Forwarding Summary Kill two birds with one stone (Congestion): router overload link overload Re-integrate shedded links when load decreases (Flexibility) Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

28. Background & Motivation Handling Overload Evaluation Summary & Future Work 13 of 22 slides Why Coverage? Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

33. Background & Motivation Handling Overload Evaluation Summary & Future Work 14 of 22 slides Coverage Summary Shed only as much as needed and only when needed (Self-optimization) Charge for message delivery ⇒ prevent selﬁsh behaviour (Fairness) Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

34. Background & Motivation Handling Overload Evaluation Summary & Future Work 15 of 22 slides Evaluation Environment OMNeT++ 20 node network – acyclic graph topology Each run – 2 · 106 messages Number of publications > subscriptions ⇒ system stabilises Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

35. Background & Motivation Handling Overload Evaluation Summary & Future Work 16 of 22 slides Figure 1: Link marking and resulting matching times in the HAPS router Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

36. Background & Motivation Handling Overload Evaluation Summary & Future Work 17 of 22 slides Figure 2: Router revenue for diﬀerent interface marking algorithms Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

37. Background & Motivation Handling Overload Evaluation Summary & Future Work 18 of 22 slides Figure 3: Backup link activation and resulting transmission times using the message shedding Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

38. Background & Motivation Handling Overload Evaluation Summary & Future Work 19 of 22 slides Summary Decoupled approach Symmetrical algorithms Fine grained approach Self-optimizing strategy Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

39. Background & Motivation Handling Overload Evaluation Summary & Future Work 20 of 22 slides Current & Future Work Formalise the market approach Integration with FADS [FC99] upper bound on message transmission delay additional parameter for overload manager Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

40. Background & Motivation Handling Overload Evaluation Summary & Future Work 21 of 22 slides Thank You for Your Attention This presentation and other related resources: http://wwwse.inf.tu-dresden.de/haps Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

41. Background & Motivation Handling Overload Evaluation Summary & Future Work 22 of 22 slides References Antonio Carzaniga, Matthew J. Rutherford, and Alexander L. Wolf. A routing scheme for content-based networking. In Proceedings of IEEE INFOCOM 2004, Hong Kong, China, March 2004. Antonio Carzaniga and Alexander L. Wolf. Forwarding in a content-based network. In Proceedings of ACM SIGCOMM 2003, pages 163–174, Karlsruhe, Germany, August 2003. Patrick Th. Eugster, Pascal A. Felber, Rachid Guerraoui, and Anne-Marie Kermarrec. The many faces of publish/subscribe. ACM Comput. Surv., 35(2):114–131, 2003. Christof Fetzer and Flaviu Christian. A fail-aware datagram service. In Iain Bate and Alan Burns, editors, IEE Proceedings - Software Engineering, volume 146, pages 58–74. IEE, April 1999. Highly Available Publish/Subscribe Zbigniew Jerzak, Christof Fetzer

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