Using evolutive summary counters for efficient cooperative caching in search engines

David Dominguez-Sal, Josep Aguilar-Saborit, Mihai Surdeanu, Josep Lluis Larriba-Pey

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We propose and analyze a distributed cooperative caching strategy based on the Evolutive Summary Counters (ESC), a new data structure that stores an approximated record of the data accesses in each computing node of a search engine. The ESC capture the frequency of accesses to the elements of a data collection, and the evolution of the access patterns for each node in a network of computers. The ESC can be efficiently summarized into what we call ESC-summaries to obtain approximate statistics of the document entries accessed by each computing node. We use the ESC-summaries to introduce two algorithms that manage our distributed caching strategy, one for the distribution of the cache contents, ESC-placement, and another one for the search of documents in the distributed cache, ESC-search. While the former improves the hit rate of the system and keeps a large ratio of data accesses local, the latter reduces the network traffic by restricting the number of nodes queried to find a document. We show that our cooperative caching approach outperforms state-of-the-art models in both hit rate, throughput, and location recall for multiple scenarios, i.e., different query distributions and systems with varying degrees of complexity.

Original languageEnglish (US)
Article number5871600
Pages (from-to)776-784
Number of pages9
JournalIEEE Transactions on Parallel and Distributed Systems
Volume23
Issue number4
DOIs
StatePublished - Jan 23 2012
Externally publishedYes

Keywords

  • Distributed systems
  • count filter
  • distributed caching
  • resource intensive applications

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Computational Theory and Mathematics

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