pweb : A Personal Interface to the World Wide Web
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1 pweb : A Personal Interface to the World Wide Web Presented by Reaz Ahmed School of Computer Science University of Waterloo Joint work with Shihabur Rahman Chowdhury, Alexander Pokluda, Md. Faizul Bari, Raouf Boutaba and Bertrand Mathieu
2 Outline Motivation Technical challenges Architecture Evaluation Summary 2
3 Motivation Advertisement industry Cloud Service Provider? Covert Agencies Internet Access Download Content Upload Content? LAN Web-content Contemporary Web hosting No Direct connection between devices 3
4 Motivation Censorship resistance Broadcast yourself without censorship Access control Define who can access what and when. Content Ownership Add, delete, modify as / when you like Flexibility Restriction on content/service type/format Our goal is to free users from these limitations 4
5 Technical Chellenges Naming: User devices don t have global/unique names Frequent IP change Availability: User devices are not persistent as Internet hosts How to ensure content availability Discovery: How to find a device and its hosted contents? Dynamic content/service hosting: How to generate & serve computationally expensive dynamic web content from low-end user devices? NAT: Usually non-public IP and behind the NAT. 5
6 Design Philosophy Compatibility with current Web technology. Naming: Unique, persistent, DNS compatible names Efficient, scalable name resolution infrastructure Availability: Group by user and replicate Cache popular contents at search/indexing servers Discovery: Open interface for name/content crawlers Dynamic content/service hosting: Light-weight http server w/ dynamic ip updater capability NAT: use STUNT or URL forward 6
7 pweb Architecture Index Search engine keyword name Legend DNS gateway Home Agent Online device User Device group Resolution Home Agent Network DNS Offline device name IP Web client Service 7
8 pweb Naming: Our Stand low latency, scalable, robust and independent naming system compatible with legacy DNS independent of any central naming authority IANA (ICANN/Verisign) Legacy DNS App NR Home Agent Network DNS User unique name within pweb for DNS compatibility
9 Functional Overview nexus.bob uw pwebproject.net Hosting device Bob s HA Any HA DNS gateway Search engine Internet user register update IP & meta-data get device / service info. index Registration Name resolution DHT lookup Crawling DHT lookup Searching Search by keyword content URL DNS lookup Device IP Device IP Service access 9
10 Home Agent Architecture Home Agent Crawler Device Plexus TCP Messaging API HTTP RESTful API Messaging Interface Forwarding Threads Incoming Message Queue Message Processor HTTP Message Processor (Mongoose Web Server) Plexus TCP Message Processor Outgoing Message Queue Message Dispatcher Thread Processing Pending Queue Index Worker Threads Local Storage Plexus Storage API Link Cache Local Name DB 10
11 Crawler Architecture Crawlers & Manager m c c Solr Cloud Web frontend HA Network 11
12 Client Software Web client HTTP Light-weight pweb Server Home Agent HTTP Home-Agent Interface pweb App Other Apps Device H/W Interface Auth. DB End user device 12
13 Results Home Agent Network Performance HA/DNS-GW in 25 PlanetLab Nodes Clients (using Dig) in 30 PlanetLab Nodes 2.5X10 5 unique names, 5X10 5 queries in parallel GeoAwareness : Maxmind GeoIP DB ~28% reduction Name Lookup Efficiency Impact of GeoAwareness 13
14 Results Home Agent Scalability One HA hammered by a micro-benchmarking tool 100ms response time for up to 400 requests/sec Mostly Due to raw file access. Better results with DB 14
15 Results Performance of a single Crawler Synthetic HA network RTT from King Dataset Geographic distribution from World Bank Open Data Max. no. of HA a single crawler can handle at which network size 2 HAs were not polled 15
16 Summary pweb characteristics A hybrid architecture Seamless integration with Web technology Open platform for independent development Other applications: Remote access for Configuration, NAS, IP camera, Sensors, etc. Personal sync and backup solutions VoIP by name: call vs call cell.alice.uw Passive device: NFC tag/qrcode /Barcode for IoT Ongoing project at http: //pwebproject. net 16
17 17
18 Evaluation Scenario Home Agent Network HA/DNS-GW in 25 PlanetLab Nodes Clients (using Dig) in 30 PlanetLab Nodes 2.5X10 5 unique names, 5X10 5 queries in parallel GeoAwareness : Maxmind GeoIP DB Home Agent One HA with varying load Crawler Synthetic HA network RTT from King Dataset Geographic distribution from World Bank Open Data 18
pweb : A Personal Interface to the World Wide Web
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