Efficient lookup on unstructured topologies

TitleEfficient lookup on unstructured topologies
Publication TypeConference Papers
Year of Publication2005
AuthorsMorselli R, Bhattacharjee B, Srinivasan A, Marsh MA
Conference NameProceedings of the twenty-fourth annual ACM symposium on Principles of distributed computing
Date Published2005///
Conference LocationNew York, NY, USA
ISBN Number1-58113-994-2
Keywordsdistributed algorithms, lookup protocols, peer-to-peer networks, random walks

We present LMS, a protocol for efficient lookup on unstructured networks. Our protocol uses a virtual namespace without imposing specific topologies. It is more efficient than existing lookup protocols for unstructured networks, and thus is an attractive alternative for applications in which the topology cannot be structured as a Distributed Hash Table (DHT).We present analytic bounds for the worst-case performance of our protocol. Through detailed simulations (with up to 100,000 nodes), we show that the actual performance on realistic topologies is significantly better. We also show in both simulations and a complete implementation (which includes over five hundred nodes) that our protocol is inherently robust against multiple node failures and can adapt its replication strategy to optimize searches according to a specific heuristic. Moreover, the simulation demonstrates the resilience of LMS to high node turnover rates, and that it can easily adapt to orders of magnitude changes in network size. The overhead incurred by LMS is small, and its performance approaches that of DHTs on networks of similar size.