A fully dynamic algorithm for distributed shortest paths

  • Authors:
  • Serafino Cicerone;Gabriele Di Stefano;Daniele Frigioni;Umberto Nanni

  • Affiliations:
  • Dipartimento di Ingegneria Elettrica, Universita dell'Aqulia, Monteluco di Roio, I-67040,L' Aquila, Italy;Dipartimento di Ingegneria Elettrica, Universita dell'Aqulia, Monteluco di Roio, I-67040,L' Aquila, Italy;Dipartimento di Ingegneria Elettrica, Universita dell'Aqulia, Monteluco di Roio, I-67040,L' Aquila, Italy and Dipartimento di Informatica e Sistemistica, Università, di Roma "La Sapienza", vi ...;Dipartimento di Informatica e Sistemistica, Università, di Roma "La Sapienza", via Salaria 113, I-00198, Roma, Italy

  • Venue:
  • Theoretical Computer Science - Latin American theoretical informatics
  • Year:
  • 2003

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Abstract

We propose a fully dynamic distributed algorithm for the all-pairs shortest paths problem on general networks with positive real edge weights. If Δσ is the number of pairs of nodes changing the distance after a single edge modification σ (insert, delete, weight decrease, or weight increase) then the message complexity of the proposed algorithm is O(nΔσ) in the worst case, where n is the number of nodes of the network. If Δσ = o(n2), this is better than recomputing everything from scratch after each edge modification. Up to now only a result of Ramarao and Venkatesan was known, stating that the problem of updating shortest paths in a dynamic distributed environment is as hard as that of computing shortest paths.