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Issue No. 04 - April (2013 vol. 62)
ISSN: 0018-9340
pp: 662-675
Hung-Chang Hsiao , Dept. of Comput. Sci. & Inf. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Che-Wei Chang , Dept. of Comput. Sci. & Inf. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Peers participating in a distributed hash table (DHT) may host different numbers of virtual servers and are enabled to balance their loads in the reallocation of virtual servers. Most decentralized load balance algorithms designed for DHTs based on virtual servers require the participating peers to be asymmetric, where some serve as the rendezvous nodes to pair virtual servers and participating peers, thereby introducing another load imbalance problem. While state-of-the-art studies intend to present symmetric load balancing algorithms, they introduce significant algorithmic overheads and guarantee no rigorous performance metrics. In this paper, a novel symmetric load balancing algorithm for DHTs is presented by having the participating peers approximate the system state with histograms and cooperatively implement a global index. Each peer independently reallocates in our proposal its locally hosted virtual servers by publishing and inquiring the global index based on their histograms. Unlike competitive algorithms, our proposal exhibits analytical performance guarantees in terms of the load balance factor and the algorithmic convergence rate, and introduces no load imbalance problem due to the algorithmic workload. Through computer simulations, we show that our proposal clearly outperforms existing distributed algorithms in terms of load balance factor with a comparable movement cost.
resource allocation, distributed processing, file organisation, movement cost, symmetric load balancing algorithm, analytical performance guarantees, distributed hash tables, DHT, virtual servers, decentralized load balance algorithms, rendezvous nodes, histogram, global index, load balance factor, algorithmic convergence rate, algorithmic workload, Servers, Peer to peer computing, Load management, Proposals, Heuristic algorithms, Indexes, Algorithm design and analysis, virtual server, Distributed hash tables, load balance

Hung-Chang Hsiao and Che-Wei Chang, "A Symmetric Load Balancing Algorithm with Performance Guarantees for Distributed Hash Tables," in IEEE Transactions on Computers, vol. 62, no. , pp. 662-675, 2013.
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