Decentralized schemes for size estimation in large and dynamic groups

Dionysios Kostoulas, Dimitrios Psaltoulis, Indranil Gupta, Ken Birman, Al Demers

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

Abstract

Large-scale and dynamically changing distributed systems such as the Grid, peer-to-peer overlays, etc., need to collect several kinds of global statistics in a decentralized manner. In this paper, we tackle a specific statistic collection problem called Group Size Estimation, for estimating the number of non-faulty processes present in the global group at any given point of time. We present two new decentralized algorithms for estimation in dynamic groups, analyze the algorithms, and experimentally evaluate them using real-life traces. One scheme is active: it spreads a gossip into the overlay first, and then samples the receipt times of this gossip at different processes. The second scheme is passive: it measures the density of processes when their identifiers are hashed into a real interval. Both schemes have low latency, scalable perprocess overheads, and provide high levels of probabilistic accuracy for the estimate. They are implemented as part of a size estimation utility called PeerCounter that can be incorporated modularly into standard peer-to-peer overlays. We present experimental results from both the simulations and PeerCounter, running on a cluster of 33 Linux servers.

Original languageEnglish (US)
Title of host publicationProceedings - Fourth IEEE International Symposium on Network Computing and Applications, NCA 2005
Pages41-48
Number of pages8
DOIs
StatePublished - 2005
Event4th IEEE International Symposium on Network Computing and Applications, NCA 2005 - Cambridge, MA, United States
Duration: Jul 27 2005Jul 29 2005

Publication series

NameProceedings - Fourth IEEE International Symposium on Network Computing and Applications, NCA 2005
Volume2005

Other

Other4th IEEE International Symposium on Network Computing and Applications, NCA 2005
Country/TerritoryUnited States
CityCambridge, MA
Period7/27/057/29/05

ASJC Scopus subject areas

  • General Engineering

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