Overlay Networks: Motivations. EECS 122: Introduction to Computer Networks Overlay Networks and P2P Networks. Motivations (cont d) Goals.
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1 Overlay Networks: Motivations CS : Introduction to Computer Networks Overlay Networks and PP Networks Ion Stoica Computer Science Division Department of lectrical ngineering and Computer Sciences University of California, Berkeley Berkeley, CA 9- Changes in the network happen very slowly Why? - Internet network is a shared infrastructure; need to achieve consensus (ITF) - Many of proposals require to change a large number of routers (e.g., IP Multicast, QoS); otherwise end-users won t benefit Proposed changes that haven t happened yet on large scale: - More Addresses (IPv 9) - Security (IPSC 9); Multicast (IP multicast 9) Motivations (cont d) Goals One size does not fit all Applications need different levels of - Reliability - Performance (latency) - Security - Access control (e.g., who is allowed to join a multicast group) - Make it easy to deploy new functionalities in the network accelerate the pace of innovation Allow users to customize their service Solution Deploy processing in the network Have packets processed as they traverse the network AS- IP Overview Resilient Overlay Network (RON) Overlay Multicast Peer-to-peer systems AS- Overlay Network (over IP)
2 Resilient Overlay Network (RON) xample Premise: by building application overlay network, can increase performance and reliability of routing Berkeley MIT Install N computers at different Internet locations Default IP path determined by BGP & OSPF ach computer acts as an overlay network router - Between each overlay router is an IP tunnel (logical link) - Logical overlay topology is all-to-all (N ) Computers actively measure each logical link in real time for - Packet loss rate, latency, throughput, etc Route overlay network traffic based on measured characteristics UCLA Reroute traffic using red alternative overlay network path, avoid congestion point Acts as overlay router Overview IP Multicast Problems Resilient Overlay Network (RON) Seventeen years of research, but still not widely deployed Overlay multicast Peer-to-peer systems Poor scalability - Routers need to maintain per-group or even per-group and persender state! - Multicast addresses cannot be aggregated Supporting higher level functionality is difficult - IP Multicast: best-effort multi-point delivery service - Reliability and congestion control for IP Multicast complicated No support for access control - Nor restriction on who can send easy to mount Denial of Service (Dos) attacks! 9 Overlay Approach Narada [Yang-hua et al, ] Provide IP multicast functionality above the IP layer application level multicast Challenge: do this efficiently Projects: - Narada - Overcast - Scattercast - Yoid - Coolstreaming (Roxbeam) - Rawflow Source Speific Trees Involves only end hosts Small group sizes <= hundreds of nodes Typical application: chat
3 Narada: nd System Multicast Properties CMU Gatech Stanford Stan Stan asier to deploy than IP Multicast - Don t have to modify every router on path asier to implement reliability than IP Multicast - Use hop-by-hop retransmissions Berk Gatech Overlay Tree Stan Berkeley Berk But - Consume more bandwidth than IP Multicast - Typically has higher latency than IP Multicast - Harder to scale CMU Stan Berk Berk Optimization: use IP Multicast where available Overview Resilient Overlay Network (RON) Overlay multicast How Did it Start? A killer application: Naptser - Free music over the Internet Key idea: share the storage and bandwidth of individual (home) users Peer-to-peer systems Internet Model Main Challenge ach user stores a subset of files ach user has access (can download) files from all users in the system Find where a particular file is stored - Note: problem similar to finding a particular page in web caching (see last lecture what are the differences?) F D A B C
4 Other Challenges Napster Scale: up to hundred of thousands or millions of machines Dynamicity: machines can come and go any time Assume a centralized index system that maps files (songs) to machines that are alive How to find a file (song) - Query the index system return a machine that stores the required file Ideally this is the closest/least-loaded machine - ftp the file Advantages: - Simplicity, easy to implement sophisticated search engines on top of the index system Disadvantages: - Robustness, scalability (?) 9 Napster: xample Gnutella m F m A m m m A m B m C m D m m F m B D m C m Distribute file location Idea: broadcast the request Hot to find a file: - Send request to all neighbors - Neighbors recursively multicast the request - ventually a machine that has the file receives the request, and it sends back the answer Advantages: - Totally decentralized, highly robust Disadvantages: - Not scalable; the entire network can be swamped with requests (to alleviate this problem, each request has a TTL) Gnutella: xample Two-Level Hierarchy Assume: m s neighbors are m and m; m s neighbors are m and m; m F m A m m B m m C D Current Gnutella implementation, KaZaa Leaf nodes are connected to a small number of ultrapeers (suppernodes) Query - A leaf sends query to its ultrapeers - If ultrapeers don t know the answer, they flood the query to other ultrapeers More scalable: - Flooding only among ultrapeers Oct Crawl on Gnutella Ultrapeer nodes Leaf nodes
5 Skype BitTorrent (/) Peer-to-peer Internet Telephony Two-level hierarchy like KaZaa - Ultrapeers used mainly to route traffic between NATed end-hosts (see next slide) - plus a login server to authenticate users ensure that names are unique across network B A login server Messages exchanged to login server Data traffic Allow fast downloads even when sources have low connectivity How does it work? - Split each file into pieces (~ KB each), and each piece into sub-pieces (~ KB each) - The loader loads one piece at a time - Within one piece, the loader can load up to five subpieces in parallel (Note*: probable protocol; Skype protocol is not published) BitTorrent (/) Distributed Hash Tables Download consists of three phases: Start: get a piece as soon as possible - Select a random piece Middle: spread all pieces as soon as possible - Select rarest piece next nd: avoid getting stuck with a slow source, when downloading the last sub-pieces - Request in parallel the same sub-piece - Cancel slowest downloads once a sub-piece has been received Problem: - Given an ID, map to a host Challenges - Scalability: hundreds of thousands or millions of machines - Instability Changes in routes, congestion, availability of machines - Heterogeneity Latency: ms to ms Bandwidth: Kb/s to Mb/s Nodes stay in system from s to a year - Trust Selfish users Malicious users (For details see: Content Addressable Network (CAN) Associate to each node and item a unique id in an d-dimensional space Properties - Routing table size O(d) - Guarantees that a file is found in at most d*n /d steps, where n is the total number of nodes divided between nodes All nodes cover the entire space ach node covers either a square or a rectangular area of ratios : or : xample: - Assume space size ( x ) - Node n:(, ) first node that joins cover the entire space n 9
6 Node n:(, ) joins space is divided between n and n Node n:(, ) joins space is divided between n and n n n n n n Nodes n:(, ) and n:(,) join n n n Nodes: n:(, ); n:(,); n:(, ); n:(,);n:(,) Items: f:(,); f:(,); f:(,); f:(,); n n n f n n n f f n f CAN: Query xample ach item is stored by the node who owns its mapping in the space n n n f ach node knows its neighbors in the d-space Forward query to the neighbor that is closest to the query id xample: assume n queries f n n n f n f f n n f f n f f
7 Chord Identifier to Node Mapping xample Associate to each node and item a unique id in an uni-dimensional space.. m - Key design decision - Decouple correctness from efficiency Properties - Routing table size O(log(N)), where N is the total number of nodes - Guarantees that a file is found in O(log(N)) steps Node maps [,] Node maps [9,] Node maps [, ] Node maps [9, ] ach node maintains a pointer to its successor Lookup Joining Operation ach node maintains its successor Route packet (ID, data) to the node responsible for ID using successor pointers node= lookup() ach node A periodically sends a stabilize() message to its successor B Upon receiving a stabilize() message, node B - returns its predecessor B =pred(b) to A by sending a notify(b ) message Upon receiving notify(b ) from B, - if B is between A and B, A updates its successor to B - A doesn t do anything, otherwise 9 Joining Operation Joining Operation Node with id= joins the ring Node needs to know at least one node already in the system - Assume known node is succ=nil pred=nil succ= pred= Node : send join() to node Node : returns node Node updates its successor to succ= succ=nil pred=nil succ= pred= join() succ= pred= succ= pred=
8 Joining Operation Joining Operation (cont d) Node : send stabilize() to node Node : - update predecessor to - send notify() back succ= pred=nil succ= pred= pred= stabilize() succ= Node sends a stabilize pred= message to its successor, node Node reply with a notify message Node updates its stabilize() successor to succ= pred=nil succ= pred= succ= succ= pred= Joining Operation (cont d) Joining Operation (cont d) Node sends a stabilize message to its new successor, node Node sets its predecessor to node succ= pred= This completes the joining operation! pred= succ= pred= pred=nil Stabilize() succ= pred= succ= pred= succ= Finger Table at i ft[i] Achieving fficiency: finger tables + ( + ) mod = Say m= Achieving Robustness To improve robustness each node maintains the k (> ) immediate successors instead of only one successor In the notify() message, node A can send its k- successors to its predecessor B Upon receiving notify() message, B can update its successor list by concatenating the successor list received from A with A itself i m ith entry at peer with id n is first peer with id >= n + (mod )
9 Discussion Conclusions Query can be implemented - Iteratively - Recursively Performance: routing in the overlay network can be more expensive than in the underlying network - Because usually there is no correlation between node ids and their locality; a query can repeatedly jump from urope to North America, though both the initiator and the node that store the item are in urope! - Solutions: Tapestry takes care of this implicitly; CAN and Chord maintain multiple copies for each entry in their routing tables and choose the closest in terms of network distance The key challenge of building wide area PP systems is a scalable and robust directory service Solutions covered in this lecture - Naptser: centralized location service - Gnutella: broadcast-based decentralized location service - CAN, Chord, Tapestry, Pastry: intelligent-routing decentralized solution Guarantee correctness Tapestry, Pastry provide efficient routing, but more complex 9 9
EECS 122: Introduction to Computer Networks Overlay Networks and P2P Networks. Overlay Networks: Motivations
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