Implementing Range Queries with a Decentralized Balanced Tree over Distributed Hash Tables

  • Lopes N
  • Baquero C
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Abstract

Range queries, retrieving all keys within a given range, is an important add-on for Distributed Hash Tables (DHTs), as theyrely only on exact key matching lookup. In this paper we support range queries through a balanced tree algorithm, DecentralizedBalanced Tree, that runs over any DHT system.Our algorithm is based on the B+ -tree  design that efficiently stores clustered data while maintaining a balanced load on hosts. The internal structure ofthe balanced tree is suited for range queries operations over many data distributions since it easily handles clustered datawithout losing performance.We analyzed, and evaluated our algorithm under a simulated environment, to show it’s operation scalability for both insertionsand queries. We will show that the system design imposes a fixed penalty over the DHT access cost, and thus inherits the scalabilityproperties of the chosen underlying DHT.

Author-supplied keywords

  • range queries over trees

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Authors

  • Nuno Lopes

  • Carlos Baquero

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