1. Coordinate Live Streaming and Storage Sharing for Social Media Content Distribution Authors: Xu Cheng, Jiangchuan Liu, Senior Member, IEEE, Haiyang Wang, and Chonggang Wang, Senior Member, IEEE Speaker : 童耀民 MA1G0222 2013.12.23

2. Outline 1.INTRODUCTION 2.MEASUREMENT STUDY 3.USER QUESTIONNAIRE SURVEY 4.COOLS SYSTEM OVERVIEW 5.COOLS DESIGN DETAILS 6.IMPROVING COOLS OVERLAY TREE 7.PERFORMANCE EVALUATION 8.CONCLUSION AND FUTURE WORK

3. 1. INTRODUCTION

4. INTRODUCTION The recently emerged user-generated contents (UGC) services, social networking services (SNS), as well as the pervasive wireless mobile network services have formed social media which has drastically changed the content distribution landscape.

5. INTRODUCTION Today such UGC applications as YouTube allow any user to be a content provider, generating enormous amount of video contents that are quickly and extensively propagated on the Internet through such SNSes as Facebook and Twitter.

6. INTRODUCTION Unfortunately, the sheer and ever-increasing data volume, the broader coverage, and longer access durations of video objects also present significant challenges than other types of objects, not only to the social networking website management, but also to the network traffic engineering and to the resource provisioning of external video sites.

7. INTRODUCTION To better understand the challenges and opportunities therein, they investigate the social networking users’ behavior from both system traces and a questionnaire survey.

8. INTRODUCTION

9. Through the posting function of social networking services, the server can broadcast the live video to the user’s friends, who can be either wired Internet users or mobile users. 1)a friend can choose to watch the live video, and thus the requirement of streaming quality, such as startup latency and playback continuity, should be satisfied;

10. INTRODUCTION 2) a friend can choose not to watch the live video, but she or he can download the video and expect to watch it later. 3) a friend shows no interest in the video.

11. INTRODUCTION In this paper, they present Coordinated Live Streaming and Storage Sharing (COOLS), a system for efficient peer-to-peer posting of user- generated videos. Through a novel ID code design that embeds nodes’ locations in a tree overlay. They also improve our overlay tree to achieve better efficiency and robustness.

12. 2. MEASUREMENT STUDY

13. MEASUREMENT STUDY Fig. 2. Number of watched and shared videos against rank.

14. MEASUREMENT STUDY Fig. 3. CDF of time span from post to watch.

15. 3. USER QUESTIONNAIRE SURVEY

16. USER QUESTIONNAIRE SURVEY Fig. 4. Breakdown of user’s concern on videos.

17. USER QUESTIONNAIRE SURVEY Fig. 5. Comparison of the possibility of watching the entire video.

18. 4. COOLS SYSTEM OVERVIEW

19. COOLS SYSTEM OVERVIEW Fig. 6. Example of overlay tree with ID.

20. 5. COOLS DESIGN DETAILS

21. COOLS DESIGN DETAILS

23. Fig. 8. Example of node demotion.

24. 6. IMPROVING COOLS OVERLAY TREE

25. IMPROVING COOLS OVERLAY TREE

26. Fig. 9. Example of improved overlay tree.

27. IMPROVING COOLS OVERLAY TREE

28. Root d1 d2 source Root 4=2 k ; k=2

29. 7. PERFORMANCE EVALUATION

30. PERFORMANCE EVALUATION Fig. 10. CDF of startup delay.

31. PERFORMANCE EVALUATION Fig. 11. CDF of data loss rate

32. PERFORMANCE EVALUATION Fig. 12. Comparison of overhead size

33. 8. CONCLUSION AND FUTURE WORK

34. CONCLUSION AND FUTURE WORK Thanks.