컨텐츠 전송을 위한 브로커 시스템 구조에 관한 연구
CollabCDS: An Architectural Design for Brokered Collaborative Content Delivery System
- 주제(키워드) content delivery , brokering system , architectural design , distributed computing
- 발행기관 아주대학교
- 지도교수 오상윤 교수
- 발행년도 2010
- 학위수여년월 2010. 2
- 학위명 석사
- 학과 및 전공 일반대학원 컴퓨터공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000010441
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
In today’s internet, we face the redundancy of contents due to the rise of social web. Redundant contents which only sit on content provider infrastructure without being accessed frequently may not bring immediate problem. However, some portals can have interests on such contents and may take benefit of them by collaborating with the content providers instead of building their own infrastructure to host and provision the contents. Content redundancy can also be visited from the emergence of cloud computing. With the inceptions of Infrastructure as a Service (IaaS) providers, contents can be hosted on infrastructure leased by the providers economically and content provisioning is to be executed by selecting from one of the providers based on certain criteria. This thesis proposes an architectural design for collaborative content delivery system to address this issue. This architecture enables contents to be fed from several content providers and snapshots of them made available on a portal that acts as the content broker. The broker in this architecture mediates every content request and delegates provisioning of the content to a content provider out of several candidates that can meet user’s required QoS level. Provider selection scheme is built on top of provider ranking system. The ranking system makes use of periodic QoS measures of providers’ networks to estimate reliability of providers in circumventing failure of QoS provisioning during a content delivery transaction. A fairness model is also introduced thus approach in the offered model is expected to bring this design to be attractive to nowadays’ content delivery regime. The simulation results show that using fair provider selection and applying load balance principle, contents can be provisioned by better pool of qualified providers thus allowing QoS levels to be expectedly satisfied in accordance with user requirements.
more목차
Abstract ii
Acknowledgements iii
List of Figures vii
List of Tables viii
List of Acronyms ix
I. Introduction 1
1.1 Introduction: The Prevalence of Social Web 1
1.2 Motivation: Harnessing Redundancy At Content Providers 3
1.3 Thesis Summary and Contributions 5
1.4 Thesis Roadmap 6
II. Related Work 8
2.1 Load Balancing Schemes 8
2.2 Content Delivery Networks 9
2.3 Service Overlay Networks 10
2.4 Streaming Multimedia Service 11
2.5 Cloud Computing 12
III. QoS-Aware Collaborative Content Delivery System 13
3.1 Network Topology of A Brokered Collaborative Content Delivery System 13
3.2 Content Delivery Scenarios 16
3.3 QoS Metrics for Content Delivery 21
3.4 Transforming QoSes into Global Ranking 23
3.5 Initializing Global Ranking of Content Providers 31
3.6 Provider Selection for Content Delivery 36
3.7 Fairness Issue and Cross Network Load Balancing 38
3.8 A Communication Protocol for CollabCDS 39
IV. Implementation and Testbed Description 41
V. Evaluation and Analysis 43
5.1 GRV Numerical Evaluation and Analysis 45
5.2 Ranking System and Provider Selection Algorithm Evaluation and Analysis 51
VI. Conclusion and Future Work 58
6.1 Lessons Learned 59
6.2 Future Work 59
REFERENCES 60
