Locating information with uncertainty in fully interconnected networks

Lefteris M. Kirousis, Evangelos Kranakis, Danny Krizanc, Yannis C. Stamatiou

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We consider the problem of searching for a piece of information in a fully interconnected computer network (or clique) by exploiting advice about its location from the network nodes. Each node contains a database that “knows” what kind of documents or information are stored in other nodes (e.g. a node could be a Web server that answers queries about documents stored on the Web). The databases in each node, when queried, provide a pointer that leads to the node that contains the information. However, this information is up-to-date (or correct) with some bounded probability. While, in principle, one may always locate the information by simply visiting the network nodes in some prescribed ordering, this requires a time complexity in the order of the number of nodes of the network. In this paper, we provide algorithms for locating an information node in the complete communication network, that take advantage of advice given from network nodes. The nodes may either give correct advice, by pointing directly to the information node, or give wrong advice by pointing elsewhere. We show that, on the average, if the probability p that a node provides correct advice is asymptotically larger than 1/ra, where n is the number of the computer nodes, then the average time complexity for locating the information node is, asymptotically, 1/p or 2/p depending on the available memory. The probability p may, in general.

Original languageEnglish (US)
Title of host publicationDistributed Computing-14th InternationalConference, DISC 2000, Proceedings
EditorsMaurice Herlihy
PublisherSpringer Verlag
Number of pages14
ISBN (Print)3540411437
StatePublished - 2000
Event14th International Conference on Distributed Computing, DISC 2000 - Toledo, Spain
Duration: Oct 4 2000Oct 6 2000

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference14th International Conference on Distributed Computing, DISC 2000

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science


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