Characterizing Chord, Kelips and Tapestry algorithms in P2P streaming applications over wireless network

1
Characterizing Chord, Kelips and Tapestry
algorithms in P2P streaming applications over
wireless network

• Hung Nguyen Chan, Khang Nguyen Van, Giang Ngo
  Hoang
• Communications and Electronics, 2008. ICCE 2008.
• Second International Conference on 2008-06-041
  Dai Co Viet Str, Hanoi Univ. of Technol., Hanoi
• Reporter 69721009 ???
• 
  69721035 ???

2
Outline

• Abstract
• Introduction
• Experimental Parameters
• Results and Discussion
• Concluding Remarks

3
Abstract

• P2P streaming applications
• flexibility, efficiency and self-scalability
  of P2P network
• Challenging task
• Intermittent nature of wireless link and the
  energy-saving mechanisms of mobile devices

4
Introduction

• DHT (Distributed Hash Table) algorithm
• Chord
• Kelips
• Tapestry

5
DHT

• ?????????????????????????????????,??????? (Binary
  search tree) ??????
• ??????????????????,????????????????,??????????
• ??????,????????????????

6
Chord

• ???hash function?key?????Chord????????
• ??node????O(log N)????????,?????????????O(log
  N)????,??????
• ????????,??????????????????(Finger
  table),???ID????

7
Chord
8
(No Transcript)
9
Kelips

• ?????,????O(1)
• Affinity Group View ??????Affinity Group
  ???????,id,hbead,rtt???
• Contacts ??????Affinity Group?????????,??contactn
  odes?????Affinity Group??????????ID
• Filetuple ??????,homenode????????,???homenode????
  ????Affinity Group??,??????????????

10
Kelips
11
Tapestry
Tapestry routing mesh from the perspective a
single node
12
Tapestry

• Neighbor maps to route overlay message to the
  destination ID digit by digit (4?42?42A?42AD
  )

13
Tapestry
Path of a message 5230?42AD
14
Experimental Parameters

• ?????????
• 1.Chord?Kelips?Tapetry???????????
• ? input?
• 2.????????????,????????
• ?????????????????
• ???????100?250?500?750?1000??????,??2??RTT
  (roundtrip time)?????????????

15
Experimental Parameters (Cont.)

• ????????,??????????????
• ???Churn rate???,?????????????????
• ???????????????????????10??600?(10??)?????????????
  ?
• ???????????????????,????????60???????????
• ???????????Chord?Kelips?Tapestry????

16
Experimental Parameters (Cont.)
17
Results and Discussion

• ?1??5????1?????,X???live nodes??????????????(Bytes
  /sec),Y??????????????????????????????Convex hull??

18
Results and Discussion (Cont.)
19
(No Transcript)
20
(No Transcript)
21
Results and Discussion (Cont.)
22
(No Transcript)
23
(No Transcript)
24
Results and Discussion (Cont.)
25
(No Transcript)
26
(No Transcript)
27
Results and Discussion (Cont.)
28
(No Transcript)
29
(No Transcript)
30
Results and Discussion (Cont.)
31
(No Transcript)
32
(No Transcript)
33
Results and Discussion (Cont.)
34
(No Transcript)
35
(No Transcript)
36
Results and Discussion (Cont.)
37
Concluding remarks

• ?Churn rate???120?????,Tapestry????????Chord?Kelip
  s???Churn rate???300????,Chord???????
• ???????(Round Trip Time, RTT)???,Tapestry?Kelips?C
  hord?????
• Chord?Tapestry??Churn rate??????????(??????????Cho
  rd???)?
• Churn rate???????????,??????????median lookup
  latency??????

38
Concluding remarks (Cont.)

• ??Chord??????????,????????????????????????,???????
  ????????,???Chord?????????????Kelips?Tapestry?Chor
  d????????????????????????????????

39

• Thank you