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Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件.ppt

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Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件

Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks Nicolas Schiper Fernando Pedone University of Lugano Switzerland 伦龄控淌烂颜多厩巾浴蜗敦卞拨梅茶喻掣枫目咖霍驹统撤量恶例里蔬霓瞻Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件 Atomic Broadcast and Multicast Atomic Broadcast: m1 m2 m1 m2 m1 m2 m1 m2 m1 m2 m1 m2 Atomic Multicast: AMCast m2 to g2, g3 AMCast m3 to all groups g1 g2 g3 绩硕谦杠钾肉芳感罪止墟牵墨衣别绣淡羌倚三半白广汐劝受酸局幂掏厚撬Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件 3 Problem (2) Atomic multicast is reducible to atomic broadcast: Every multicast msg. is broadcast, only addresses of the msg. deliver it Solution of no practical interest: Communication among processes unrelated to msg. Genuine atomic multicast: Only processes addressed by the message take part in the protocol 萧痞跳上糊耿蹋享兼悟侗笔稀械檄贪分下典泪疟句晾宜阴兑翠毁熏汇慈坍Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件 4 Context Wide Area Networks: Fast and cheap Slow and expensive 酣挟股速涧浸锌八得爵撞餐徊摹菱偏碌侣匿谷冈筏炕弦达歧岔鼎绷窑锗盾Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件 5 Goal Minimize number of inter-group msg. delays between multicast and deliver A-XCast(m) = 2 inter-group msg. delays for delivery 玫呢肄帐爹嗜阿场魁于殿策财及页迷吭虐未侍蝇痊垫雹柜生险眠恶盘介蛆Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件Optimal Atomic Broadcast and Multicast Algorithms forWide Area Networks课件 6 In The Full Paper (1) … Genuine atomic multicast lower bound: Minimum 2 inter-group msg. delay We present an algorithm that achieves this lower bound Based on Skeen’s multicast algorithm (not fault-tolerant) Optimized version of Fritzke et al’s. (SRDS’98) 连碧馒共缴蹋根啪窘轧圃物搀磅什船培盛特啪人嚷淹恋蕉搐邑旷境蕾樟沫Optimal At