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Bustamante & Yi Qiao Department of Computer Science Northwestern University {fabianb,yqiao}cs.northwestern.edu@y 7#P2P and heterogeneity(P2P computing: sharing of computer resources & services by direct exchange between participants Purest form & all peers are equal Problem: clash between assumption and reality - peer populations show high variations on storage, bandwidth, latency, degree of sharing, uptime, & Transient peers and P2P systemsPeers defined an overlay network Set of connections to other peers (their  friends ) Maintenance protocol that repairs the overlay Degree of peer transiency Median up-time ~ 70 Implications Maintenance-related messages Plus degree of replication, effectiveness of caches, spread of queries, overall system scalability, & |!b"" !b"   Our approachPart of the problem is whom one befriends One solution: pick those that will live/stay long Without knowing the future, can we predict it? Yes; peer lifespan follows a Pareto distribution! Given a good prediction - how should it be used in P2P protocols? Can it really help?b*2/3V*2/3 V !Determining lifespan distribution9In Gnutella, using a modified client, between March 1st-8th, 2003 Some details: Attempt a Gnutella connection setup 20 monitoring peers for fine probe granularity First-time found peers only recorded with Time-When-Found Peer considered dead when Connection attempt fails 3rd time Unexpected response is received tPC5' Peer lifespan distribution  Peer Lifespan and P2P protocols Choosing among  acquaintances : When deciding whom to befriend Responding to requests for references In most P2P protocols  random selection Peer lifespan fits a Pareto distribution Pareto distributions  UBNE class (Used Better than New in Expectation) Peer s expected remaining lifetime directly proportional to current age n E `E`(`@ b{`,z0Some of the questions & , How could we incorporate lifespan-based ideas into P2P systems? Potential gains in reduced maintenance overhead Effects on application performance &  Lifespan-based protocolsAIncreased dependency as commitment to the community becomes clearBB Experimental setupRTrace-driven simulation  P2P simulator includes membership management and various query distribution, cache and replication strategies Runs of one of the 20 collected traces for a period of 510,000 sec., ~36,577 peers Cold start, warm-up ~80,000 sec. excluded ~1,000 peers under stable conditions Alternative protocols comparedUnstructured Decentralized Protocol (UDP) ~ early Gnutella Separate pools for cached pongs (per connection) Pong replies include random set of entries from cache Hierarchical Decentralized Protocol (HDP) ~ new Gnutella, KaZaa Leaf- and ultra-peers: leafs can only connect to ultras; ultras to anybody To decide a peer s role  trace informationb+x+++H+ VComparing connection breakdownsrIndicator of stability " Lifespan-based protocols More selective ! fewer breakdowns Reductions 42-43% -LSPAN-2 26-30% -LSPAN-1 and LSPAN-3 Saw-tooth shape ! time-of-day patternspd-)"(# b -`)b Comparing connection rejections Comparing number of connections"A preview: Effects on applicationswGains in scalability With random-walkers & NCU (Neighboring Caching) Lifespan-based: 5 and random topology: 16 walkers cx Conclusions and future workPeer lifespan fits a Pareto distribution  current age to predict lifespan Illustrative lifespan-based protocols Advantages of considering peers age in P2P protocols Possible research paths Effect on query distribution and cache strategies Lifespan-based strategies Determining a peer s age in decentralized P2P systems Lifespan and DHTs @N/8  ` .T3f` T3f3f` 999MMM` lff3f3޲` eoHff33Ҷ` ff!>?" dd@$?nPd@ d " @ ` n?" dd@   @@``PR   @ ` `(p>>  SK ,(  , , s *m "0`  T Click to edit Master title style! ! , c $p " 0  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     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