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Project: Gedistribueerde Systemen

Project: Gedistribueerde Systemen. Bart Stukken Bjorn Schobben Wietse Jorissen. Consensus. Basis : r eliable multicast Iedereen krijgt elk pakket slechts 1 keer Alle clients akkoord ( hun Lamport) Enkel request of agree sturen N pakketten per request = dicide

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Project: Gedistribueerde Systemen

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  1. Project: Gedistribueerde Systemen Bart Stukken Bjorn Schobben Wietse Jorissen

  2. Consensus • Basis : reliablemulticast • Iedereen krijgt elk pakket slechts 1 keer • Alle clients akkoord (hun Lamport) • Enkel request of agree sturen • N pakketten per request = dicide • Max alle Lamports = ordering • N² pakketten totaal op netwerk • Heartbeats niet geordend, wel consensus ronde • View = session-id

  3. Ordering • Eigen logische klok • Lamport te weinig (happend before) • Vector te groot (N clients) • minLamport = consensus set • maxLamport = netwerk afgesproken ordering • Random = collisiondecision • Iedereen gelijke kansen • Ring object • Zodat … < 254 < 255 < 0 < 1 < 2 < …

  4. Membership • Vrijwillige participatie • Join/Leave request (niet consensus) • Changeview bericht (consensus) • Onvrijwillig vertrekken • Heartbeats • Antwoord: Client nog aanwezig • Geen antwoord: Client crash/dc • Changeview bericht (consensus)

  5. Features • Reliable Multicast • Geen speler limiet • Instelbare dimensie en winconditie • Volledig kleurenspectrum • Pauzeren • Consistente volgorde van berichten • Dynamisch deelnemen • Vrijwillig en onvrijwillig (+/-) vertrekken

  6. Demo

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