ptp. Soo-Bae Kim 4/09/02 isdl@snu. What is peer to peer?. Communication without server advantage No single point of failure Easy data sharing disadvantage No service quality guarantee Increased network traffic . Outline. Chord? Chord protocol simulation and experiment result
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path length= hops
improve routing fault tolerance owing to having more next hops.Multi-dimension coordinate spaces.
Contents of the hash table are replicated on every realities.
Improve routing falult tolerance,data availability and and path lengthRealities:multiple coordinate spaces
Reducing average query latency
but increasing the size of the database and query traffic by a k factor.Multiple hash function
Latency stretch: ratio of the latency on the CAN network to the average latency on the IP network.Topologically-sensitive construstion of CAN overlay network
Whois,traceroute (GeoTrack) network delay measurement (Geoping)Due to proxies
But ,in recent years, provide richer connectivity with wide bandwidth.
From several known locations to hosts in the univ.
linearized distance:sum of the lengths of the individual hopsConsider component
For small delay value(<10ms),most of the hosts(>90%) correct.
But for large value delay(>40ms), provide 70% confidence.(error of at least 300~400km)CDF of distance
Next find the nearest neighbor in delay map using Eucledian distance
several percent levels of error distance as a function of a number of probes
Having 7 to 9 probes would be ideal for NNDS.
Well-distributed probe yield better accuracyNNDS