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arXiv 1702.03534cs.DCcs.DM
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树中具有定制建议的领导者选举

Leader Election in Trees with Customized Advice

Barun Gorain, Andrzej Pelc

摘要:

Leader选举是分布式计算中的一个基本对称破缺问题。网络中的所有节点都必须同意一个节点,称为领导者。如果网络的节点有不同的标签,那么在单个节点上达成一致意味着所有节点都必须输出当选领导者的标签。如果节点是匿名的,则领导者选举的任务如下:网络的每个节点必须输出一条从它开始的简单路径,该路径被编码为端口号序列,使得所有这些路径都在一个共同的节点,即领导者结束。本文研究了匿名树中的确定性首领选举问题。我们的目标是建立之间的权衡分配的时间$τ$和信息量,必须给{ \em先验}的网络节点,使领导选举的时间$τ$。遵循{具有建议的\em算法}的框架,该信息在开始时由知道整个树的oracle以分配给所有节点的二进制串的形式提供给所有节点。有两种可能的变体来表达这个建议任务。提供给所有节点的字符串是相同的,或者分配给不同节点的字符串可能是潜在不同的,即,建议可以{ \em自定义}。相对于以前的文件,领导人选举的建议,在本文中,我们认为后者的选择。所有分配的二进制字符串的最大长度称为{通知的\em大小}。对于一个给定的时间$τ$分配给领导选举,我们给出了上界和下界的最小尺寸的建议足以执行领导选举的时间$τ$。除了一对外,我们所有的边界都紧到乘法常数,在这个例外的情况下,上限和下限之间的差距非常小。

英文摘要:

Leader election is a basic symmetry breaking problem in distributed computing. All nodes of a network have to agree on a single node, called the leader. If the nodes of the network have distinct labels, then agreeing on a single node means that all nodes have to output the label of the elected leader. If the nodes are anonymous, the task of leader election is formulated as follows: every node of the network must output a simple path starting at it, which is coded as a sequence of port numbers, such that all these paths end at a common node, the leader. In this paper, we study deterministic leader election in anonymous trees. Our goal is to establish tradeoffs between the allocated time $τ$ and the amount of information that has to be given {\em a priori} to the nodes of a network to enable leader election in time $τ$. Following the framework of {\em algorithms with advice}, this information is provided to all nodes at the start by an oracle knowing the entire tree, in form of binary strings assigned to all nodes. There are two possible variants of formulating this advice assignment. Either the strings provided to all nodes are identical, or strings assigned to different nodes may be potentially different, i.e., advice can be {\em customized}. As opposed to previous papers on leader election with advice, in this paper we consider the latter option. The maximum length of all assigned binary strings is called the {\em size of advice}. For a given time $τ$ allocated to leader election, we give upper and lower bounds on the minimum size of advice sufficient to perform leader election in time $τ$. All our bounds except one pair are tight up to multiplicative constants, and in this one exceptional case, the gap between the upper and the lower bound is very small.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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