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Management: Quotas/Updates/Deletes. DHash Design: Block vs. File ? ... Deletes. No explicit delete: data stored for an agreed interval and discarded unless ...
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Vivaldi Synthetic Coordinates. Each node estimates its own position ... Vivaldi in action. Execution on 86 PlanetLab Internet hosts ...
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Decreases the number of message exchanges to O(log N) DHash/Chord Interface ... Lookup(blockID) List of node-ID, IP address finger table with node IDs, IP address ...
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A Co-operative file system where multiple users can share a directory structure. Data is stored on distributed hosts ... Inode. File. 536 attrs Log Records ...
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lookup() returns list with node IDs closer in ID space to block ID ... Lookup(blockID) List of node-ID, IP address finger table with node IDs, IP address ...
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Wide-area cooperative storage with CFS
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How to look up a key quickly ? Node joins (departures) The base Chord protocol ... How to look up a key quickly ?(cont.) finger table for node 1 ...
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Distributed lookup and fetching based on scoped flooding, keyword search. Freenet ... Also supports pre-fetching of blocks to reduce user perceived latencies. ...
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Gabriel Antoniu, projet PARIS, IRISA/INRIA. Le mod le pair- -pair ... Placement arbitraire des objets. Simplifier le probl me. Une cl unique pour chaque objet ...
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... presents the design of UsenetDHT, a system that reduces the individual cost of ... It introduces the Passing Tone algorithm that provides efficient maintenance for ...
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Non-Transitive Connectivity and DHTs. Mike Freedman. Karthik Lakshminarayanan. Sean Rhea. Ion Stoica. WORLDS 2005. X. Distributed Hash Tables... System assigns ...
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PlanetLab is a global research network that supports the ... Linux kernel (Fedora Core) Vservers (namespace isolation) Schedulers (performance isolation) ...
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Chord: A Scalable Peer-to-peer Lookup Service for Internet Applications Dr. Yingwu Zhu
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CL file sharing application needs bandwidth to support high demand for rich content ... is a robust distributed file sharing network that incorporates P2P research ...
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Homework 5 and 6 due in April. Project 5 and 6 due in April and ... (Bit)Torrents for faster download. Legality. Are there any good legal uses for P2P systems? ...
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Chord: A Scalable Peer-to-peer Lookup Protocol for Internet Applications Xiaozhou Li COS 461: Computer Networks (precept 04/06/12) Princeton University
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... distributed hash table * Distributed hash table Distributed application get (key) data node node node . put(key, data) DHT provides the information look up ...
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670 machines spanning 325 sites and 35 countries. nodes within a LAN-hop of 3M users ... Stork (environment service): Arizona. Emulab (provisioning service): Utah ...
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Claims to avoid O(log N) consistent hashing imbalance using virtual servers. However, the number of virtual servers on a machine is a local administration decision ...
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Title: Systems Area: OS and Networking Author: Campus User Last modified by: Ion Stoica Created Date: 2/16/1997 2:02:43 PM Document presentation format
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Title: OpenHash vs. Your Mother Author: Trial User Last modified by: Trial User Created Date: 8/17/2004 5:32:20 PM Document presentation format: On-screen Show
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Sean Rhea, Byung-Gon Chun, John Kubiatowicz, and Scott Shenker. UC Berkeley (and now MIT) ... Sean C. Rhea. Fixing the Embarrassing Slowness of OpenDHT on ...
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Hospitals, government agencies, etc. These services need to be robust ... Directory blocks, inode blocks, data blocks; Chord ID = H(block contents) 995: key=901 ...
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Higher overheads for popular content Unstructured Effective in locating highly ... Uniform and random load and data distribution ... which include delay, ...
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Title: Building Peer-to-Peer Systems With Chord, a Distributed Lookup Service Author: Robert Morris Last modified by: Robert Morris Created Date
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CS290F, Winter 2005 Large-scale Networked Systems Instructor Ben Y. Zhao (ravenben at cs.ucsb.edu, 1151 Engineering I) Office hour: Thur, 3-4pm Lecture time: TuTh, 1 ...
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inodes are stored in modifiable DHT blocks (UCBs) ... directories contain file name, inode key entries. use indirect blocks for large files ...
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Kazaa. Hybrid of Napster model and Gnutella model. Notion of a super peer ... 'Free-riding' Definition: downloading but not sharing any data ...
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http://isp.com/dog.jpg Spot /A URLs hard-code a domain and a path ... ICANN and WIPO politics. technical coordinator inventing naming rights ...
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Describe methods and invariants needed to implement a new ... BSD implemented VFS for NFS: aim dispatch to different filesystems. VMS had elaborate filesystem ...
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Building a Reliable Mutable File System on Peer ... No cache consistency issues. ... immutability of DHT (no public-key crypto or cache consistency problems) ...
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Examples: CAN, Chord, Pastry, Tapestry, ... Basic operation: Large ... Usage Examples. OceanStore / Sahara Retreat ravenben@eecs.berkeley.edu. January 14, 2003 ...
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Peer-to-peer (P2P) has emerged as an important paradigm model for sharing ... Torus. Hierarchical. Multi-column. and so on... 12 /40. Quorum-Based Schemes (1/2) ...
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peer-to-peer file systems. Presented by: Serge Kreiker 'P2P' in the Internet ... xyz.mp3. So Far. Centralized : Napster - Table size O(n) - Number of hops O(1) ...
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Internet users cooperating to share, for example, music files ... Attacker controls enough nodes to foil the redundancy. N32. N10. N5. N20. N110. N99. N80 ...
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Peers form self organizing overlay networks over IP network. Allows access to its resources ... How do we balance consistence and network overhead? Strengths ...
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DFS: supports multiple users, multiple sites, and (possibly) distributed storage ... stub receives the request, 'un-marshalls' the parameters & passes them to the ...
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structures de donn es, mises jour. mod les de coh rence. Prototype ... Bibliographie. F. Picconi. Design and implementation of a highly resilient and secure peer ...
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Publish(key, object): ensures that the locally stored object can be located using the key. ... may be published under the same key from different locations. ...
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Divorce information from location... Data Location & Routing (Tapestry) Data Update (1/2) ... { Search for cached object location. Once found, route via IP or ...
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Peer-to-Peer Networks. Distributed Algorithms for P2P. Distributed ... Censor-resistant stores [Eternity, FreeNet, ...] Application-layer multicast [Narada, ...
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File sharing: Overnet. IPTPS 2006. 5. Churn Spectrum. Temporary Churn ... File Sharing. IPTPS 2006. 6. Temporary Churn. Let's look at temporary churn effects ...
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lookup(key) node IP address. Application may be distributed over many nodes ... Can store keys in other DHT values. And thus build complex data structures ...
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trend: applications increasing in scale (clients, distribution) examples: wide-area real-time multicast (PayPerView), data dissemination ...
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Ideally, best projects will become conference or ... You can either choose one of these projects or come up with your own ... Project 2: the DIY P2P protocol ...
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Chord: A Scalable Peer-to-peer Lookup Service for Internet Applications. Robert Morris ... Inspired by Napster, Gnutella, Freenet. Separates publishing from serving ...
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Balance load (flash crowds) Handling failures. Coping with systems in flux ... Forward a lookup for a key to a closer node. Join: insert node in ring ...
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Links are formed arbitrarily, with no relation between the content held by nodes ... Brad Karp and H. T. Kung, Harvard University ...
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Princeton University Associate Research Scholar. PlanetLab Consortium ... Coral: NYU, Stanford. Cobweb: Cornell. Storage & Large File Transfer. LOCI: Tennessee ...
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Replica Diversion. Purpose?: Balance remaining free storage. Store Success? ... File Diversion. Balance Free Storage in NodeId Space. Retry Insert Operation ...
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Dynamic (So, the system must be self-organizing and self-repairing = self-tuning) ... Tick mark: Block' ID. Square: Server. Circle: immediate successors of server ...
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