Optimal caching for first-order query load-balancing in decentralized index structures

  • Authors:
  • Anwitaman Datta;Wolfgang Nejdl;Karl Aberer

  • Affiliations:
  • Nanyang Technological University, Singapore;University of Hannover, Germany;Ecole Polytechnique Fédérale de Lausanne, Switzerland

  • Venue:
  • DBISP2P'05/06 Proceedings of the 2005/2006 international conference on Databases, information systems, and peer-to-peer computing
  • Year:
  • 2005

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Abstract

Balancing query-load in structured overlays is an important and mostly unattended problem, apart from heuristics to deal with hotspots. We determine the optimal caching strategy - how many caches (dependent on relative frequency of queries) to reduce search latency and where to place these caches? Our query-adaptive replication scheme provides first-order balancing of query-load. We also elaborate the limitations of first-order balancing (ignored by all existing heuristics) though it should have been obvious given the experiences of the P2P community with storage-load balancing. This work lays the ground for our on going work on load-aware routing in structured overlays as a mechanism complementing caching to achieve query-load balancing.