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Frans Kaashoek, Hari Balakrishnan Presented by Shreeram Sahasrabudhe (sas4@Lehigh.edu)*O (P6 Chord is a 0Distributed lookup protocol to address the core operation of resource location for which peer-to- peer systems exist  Mapping a given key onto a node .u#FeaturespRobust - Efficiently adapts to concurrent nodes joining and leaving the system Reliable - Can answer queries even in a continuously changing system Efficient routing needs only O(log N) of information per node Scalable - each node maintains only local information Is provided as a application-independent component. The software is a library that applications can use.*qA ApplicationsCooperative Mirroring  Uniform mirroring of updates to a distribution across all servers Time Shared Storage  for people wishing to have their content continuously on the system while they remain intermittent Distributed Indexes  support for Gnutella like keyword searches. Here key=keyword, value=machines Large scale combinatorial SearchXZXBase Chord ProtocolSpecifies - How to find the location of keys - Scalable Key Location provided by finger table - How new nodes join the system? Chord needs to correctly maintain: Each node s successor For every key k, node successor(k) should be responsible for k #1-!#U" ") !#  T1&Chord further adds& Modifications for handling concurrent operations such as joining of nodes and failures Stabilization Protocol to keep nodes successor pointers up to date No instant updates to finger table as joining does not damage the performance of fingers @WW Experiments and ResultsReports from Iterative Protocol Simulator (104 nodes; keys - 105 to 106) Operational Chord based system on Internet hosts Load Balancer ZmZ Z 3  Results Cont& *The load be balanced by use virtual nodes. !Path Length and Failure in lookup Path Length   ` ̙33` ` ff3333f` 333MMM` f` f` 3>?" dd@,|?" dd@   " @ ` n?" dd@   @@``PR    @ ` ` p>> l(    6 P  T Click to edit Master title style! !  0   RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  0 ``  @*   0p `   B*   0t `   B* H  0޽h ? ̙33 Default Design 0$(  r  S p  r  S 4 0  H  0޽h ? ̙33  @:(  r  S 싏     S LP`   "p`PpH  0޽h ? ̙33  P$(  r  S 0P   r  S p  H  0޽h ? ̙33  ` $(   r  S @P   r  S 0_ _ H  0޽h ? ̙33N   p$(  $r $ S H:G  G Z8 ;0  $  $ 0A?;V 0 ,$D 0v $ 0G :  Identifier Circle Identifiers - 0  2m-1 Successor(k) is the first node clockwise from k< I -' 1r $ S  Gp  G >l p p   $,$D 0ZB $ s *Dp p `2 $ 0 p ,l    $Pp@,$D 0TB $ c $D PTB $B c $D B  $ 0DP*,$D 0l `` d $`,$D 0  $ <``  FSuccessor[6] = 7 TB  $ c $Dy dY dX $ 0A?p H $ 0޽h ? ̙33  (:(  (r ( S lP    ( S dV  "p`PpH ( 0޽h ? ̙33D  ,(  ,r , S Gp  G r , S wG G X , 0A?PH , 0޽h ? ̙33D  0(  0r 0 S `0   r 0 S   X 0 0A?P(H 0 0޽h ? ̙33   4(  4r 4 S P{G@P  G r 4 S ĜG@@ G X 4 0A? X 4 0A?`  4 0H{ 0 w3Lookup Failure = f(rate at which nodes fail & join)(4 " 4 0$0 P6  s/Lookup Failure = f(fraction of nodes that fail)(0 X 4 0A? ` X  4 0A? `   4 0 @  Y)Lookup Latency on the Internet Prototype* *H 4 0޽h ? ̙33r0UA!C#/%'q0s24 7< cOh+'0 hp   PowerPoint Presentationoweowe Shreeramt P16eMicrosoft PowerPointon@3V@@pX>/GG g  B& &&#TNPPt2OMi & TNPP &&TNPP    --- !---&G&ww@ CwCw w0- &Gy& --iyH-- @Times New RomanCwCw w0- .(2 nChord: A Scalable Peer'*!!. . 2 -. . 2 to. . 2 -o. .2 Peer !. .12 ALookup Service for Internet #!. .2 J Applications*.--qH-- @Times New RomanCwCw w0- . 2 XIon  . .2 ~Stoica   . .*2 , Robert Morris, David      . .2 Karger  . .2 , M. . .2  Frans Kaashoek   . . 2 , . .!2 Hari Balakrishnan    .@Times New RomanCwCw w0- .2 Y Presented by   .@Times New RomanCwCw w0- .B2 |'Shreeram Sahasrabudhe (sas4@Lehigh.edu)         .--"System !8)Bw-&TNPP &2՜.+,0    8On-screen Shown-s9   Times New RomanDefault DesignHChord: A Scalable Peer-to-Peer Lookup Service for Internet Applications Chord is a Features ApplicationsBase Chord ProtocolChord further addsExperiments and ResultsResults Cont"Path Length and Failure in lookup  Fonts UsedDesign Template Slide Titles  _*=GShreeramShreeram  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~Root EntrydO)PicturesvCurrent UserSummaryInformation(PowerPoint Document(N=DocumentSummaryInformation8