Stabilizing consensus with the power of two choices

Stabilizing consensus with the power of two choices
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以两种选择的力量稳定共识

DOI:
10.1145/1989493.1989516
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发表时间:
2011
期刊:
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影响因子:
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通讯作者:
Doerr B
Doerr B
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作者:
Doerr B

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在标准的一致性问题中,存在可能具有不同输入值的进程,目标是最终达到所有进程都致力于这些值中的一个的点。我们正在研究共识问题的一个微小变体,称为稳定共识问题[2]。在这个问题中,我们不要求每个进程在某个点上提交一个最终值,但最终它们会在不一定意识到这一点的情况下获得一个共同的、稳定的值。无论进程处于何种启动状态,这都应该起作用。我们的主要结果是一个简单的随机算法,称为中值规则,该算法高概率只需要O(logmlogn+logn)时间和每个进程的工作,就可以对任何一组非法值达成几乎稳定的共识,只要对手在任何时间都可以破坏至多√n个进程的状态。在没有对手参与的情况下,需要JUSTO(LOGN)时间和工作来达成稳定的共识,可能性很大。作为一个副产品,我们得到了一个简单的分布式算法,在对抗性存在的情况下,逼近时间O(logmlogn+logn)中n个数的中位数。
In the standard consensus problem there arenprocesses with possibly different input values and the goal is to eventually reach a point at which all processes commit to exactly one of these values. We are studying a slight variant of the consensus problem called thestabilizing consensus problem[2]. In this problem, we do not require that each process commits to a final value at some point, but that eventually they arrive at a common, stable value without necessarily being aware of that. This should work irrespective of the states in which the processes are starting. Our main result is a simple randomized algorithm calledmedian rulethat, with high probability, just needsO(logmlog logn+ logn) time and work per process to arrive at an almost stable consensus for any set ofmlegal values as long as an adversary can corrupt the states of at most √nprocesses at any time. Without adversarial involvement, justO(logn) time and work is needed for a stable consensus, with high probability. As a by-product, we obtain a simple distributed algorithm for approximating the median ofnnumbers in timeO(logmlog logn+ logn) under adversarial presence.
DOI: --
发表时间: 1999
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