RASTER: A Light-Weight Routing Protocol to Discover Shortest Overlay Routes in Randomized DHT Systems

  • Authors:
  • Chih-Chiang Wang;Khaled Harfoush

  • Affiliations:
  • North Carolina State University, USA;North Carolina State University, USA

  • Venue:
  • ICPADS '06 Proceedings of the 12th International Conference on Parallel and Distributed Systems - Volume 1
  • Year:
  • 2006

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Abstract

In this paper, we propose a novel routing protocol, RASTER, that approximates shortest overlay routes between nodes in randomized DHTs. Unlike previously proposed routing protocols, RASTER encodes and aggregates routing information. Its simple bitmap-encoding scheme together with the proposed RASTER routing algorithm enable a performance edge over current overlay routing protocols. RASTER provides a forwarding overhead of merely a small constant number of bitwise operations, a routing performance close to optimal, and a better resilience to churn. RASTER also provides nodes with the flexibility to adjust the size of the maintained routing information based on their storage/processing capabilities. The cost of storing and exchanging encoded routing information is manageable and grows logarithmically with the number of nodes in the system.