social cloud: cloud computing in social networks
DESCRIPTION
With the increasingly ubiquitous nature of Social networks and Cloud computing, users are starting to explore new ways to interact with, and exploit these developing paradigms. Social networks are used to reflect real world relationships that allow users to share information and form connections between one another, essentially creating dynamic Virtual Organizations. We propose leveraging the pre-established trust formed through friend relationships within a Social network to form a dynamic “Social Cloud”, enabling friends to share resources within the context of a Social network. We believe that combining trust relationships with suitable incentive mechanisms (through financial payments or bartering) could provide much more sustainable resource sharing mechanisms. This paper outlines our vision of, and experiences with, creating a Social Storage Cloud, looking specifically at possible market mechanisms that could be used to create a dynamic Cloud infrastructure in a Social network environment.TRANSCRIPT
Social Cloud: Cloud Computing in Social Networks
Kyle Chard, Simon Caton, Omer Rana and Kris Bubendorfer
Emerging Themes
• Cloud Computing is growing in strength– Many providers e.g. Amazon EC2/S3, Google App
Engine, Microsoft Azure and also many smaller scale open clouds such as Nimbus and Eucalyptus.
• Social Networking is increasingly ubiquitous:– E.g. Facebook has over 400 Million active users.– 50 % of these users log on every day
Current Cloud Scenarios and Problems
• Sharing– Finite capacity vs. fluctuating requirements– Many social peers with different capabilities
• Economy– Small scale consumers have ad hoc requirements– Money grabbing providers and inflexible lock-in
• Trust– always assumed at some level– Anonymity (Market-based/broker allocation)– Many models fall apart when this is removed
Social Networks
• Formed through pre-existing relationships, – i.e. your friends
• Have a pre-existent fabric of trust inherently interwoven into the network– How many of your friends do you not trust?
• Many applications now use social networks as a platform for:– Authentication e.g. Facebook Connect– Application Portals e.g. ASPEN and PolarGrid projects
• There already exist well established application APIs
The Social Cloud Vision
+ +
• An amalgamation of:– Social Networking– Cloud Computing– Volunteer Computing
A Social Cloud allows friends to share capabilities within the context of a Social Network.
Volunteer computing arises as users can share resources for little or no gain, perhaps through reciprocal arrangements.
The leveraging of pre-existing relationships in order to enable mutually beneficial interactions within a cloud context.
Social Cloud Interaction Vision
Social Cloud
Socially – orientated
Market Place
Social Cloud Economy
• Payment (in an economic sense) is optional• Instead we utilise a virtual currency– All collaborations involve a transfer of “credits”– All participants are given an initial amount of
credits– No one can buy additional credits – they must be
earned– Therefore, we can prevent free-riding, and actively
encourage participation
Community Effect
• Susceptible to cheating through fabricated accounts– Social Enforcement: exclusion of anti-social peers
• To encapsulate the nature of an interaction an agreement is used for the domains:– Technical Requirements– Non-functional properties– Temporal Requirements– Economic preferences
• WS-Agreement + EJSDL + DRIVE API + Reservation + Social Cloud Extensions
Social Cloud Proof of Concept
• Simple Storage Service Implemented as a Facebook application
• Use Case: a back up facility
Agreement
Posted Price
Storage
Social Cloud
StorageStorage
MDS
User ID URL Capacity Price
User1 100MB 5User2 500MB 10User3 5GB 7
– Enables interactions based upon active trading/collaborative decisions
– Intuitively facilitates reciprocal collaboration– Current “norm” in industry solutions
Dynamic Auctions
• Auction:– Enables dynamic participant pairing– Sealed bid second price reverse auction
• Could be extended to any other auction mechanism
Evaluation
Research Questions:• Can a Social Cloud Scale?• What are the computational requirements for
an “average” sized Social Cloud?– According to Facebook, the average social network
has 130 participants• Can a Social Cloud function in a timely manner
as a Facebook application?
Posted Price Scalability
• Varying the size of the MDS and number of matches• With a size of 2000, 100 matches can be discovered
in ~ 2 seconds, which is reasonable
Auction Scalability
• 500 Auctions and the worst case scenario: – all auctions run concurrently
• Even with 50 bidders can still complete 65 auctions per minute
• Under our assumptions this is already enough for a large social network
Dissemination of Results
• A social (storage) cloud can be hosted using minimal resources (3 – 4 yr old PC)
• Components show good throughput under realistic loads
• However, scaling to millions of users would require a dedicated HPC or elastic environment– Co-op model members sustain the platform
Conclusions & Future Work
• Social Cloud– Dynamic cloud environment leveraging existing trust
relationships– Proof-of-concept: can be extended for many new
scenarios• Future Work– Computation, licenses and other capabilities– Combinatorial auctions– Generic scientific cloud communities – e.g. myExperiment– Evolution of the economic model
Questions?
Please look at our Prototype Social Cloud Videohttp://www.im.uni-karlsruhe.de/SocialCloudDemo
[email protected] / [email protected] [email protected]@cs.cardiff.ac.uk [email protected]