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Canon in G Major: Designing DHTs with Hierarchical Structure

Explore the paper "Canon in G Major" presenting a hierarchical DHT design benefiting P2P applications, file sharing, multimedia sharing, and collaborative computation. Learn about fault isolation, growth adaptation, flat and hierarchical designs, DNS Canonical System, and Crescendo merging. Evaluate Crescendo's routing efficiency, fault isolation, and security aspects compared to other DHTs. Critique the design's strengths and weaknesses while considering new ideas and improvements.

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Canon in G Major: Designing DHTs with Hierarchical Structure

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  1. Canon in G Major: Designing DHTs with Hierarchical Structure Prasanna Ganesan(Stanford University) Krishna Gummadi(University of Washington) Hector Garcia-Molina(Stanford Universiy)

  2. Motivating Scenario • P-2-P Application • File sharing • Multi-media sharing • Collaborative computation • General purpose lookup directories

  3. Motivating Scenario Where is the paper “Canon in G Major”?

  4. Hierarchy Design • Isolating faults • Adapting growth Single Point Over Head

  5. Flat Design(DHT) • No single point of failure

  6. Flat & Hierarchical Design • Flat Design • No single point of failure • P2P(DHT) • Hierarchical Design • Isolating faults • Adapting growth • DNS

  7. Canonical System

  8. Crescendo Merged Chord Chord Chord

  9. Chord • Circular N-bit ID space • Node x links to succ(x+2^i)

  10. Crescendo • Merge • Merging multiple rings • Multi-level hierarchies • Incremental • New node joins bottom up • Links per node • Log(n)

  11. Merging

  12. Merging • Merging Rule • Closer than any other black node • Y=succ(x+2^i)

  13. Routing Crescendo(intra-domain) 0 -> 12 Greedy Clockwise routing Path Locality -Fault isolation -Security -Efficiency

  14. Routing Crescendo(inter-domain) 0 -> 13 5 -> 13 Path convergence :closest node to destination in the domain :same destination node same last node in the domain -Distributed Caching -Bandwidth savings

  15. Other DHTs • Chord => Crescendo • CAN => Can-Can • Symphony => Cacophony • Kademlia => Kandy

  16. Evaluation • Links/node • Hops/query • latency

  17. Number of Links vs. Number of Levels

  18. Levels vs. Routing Hops

  19. Path Locality

  20. Critique • Strong point • Novel Idea • Good development of idea • Weak point • Poor motivating scenario

  21. New Idea • Do you have any New Idea?

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