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The Research of Load Balance for DHT Server Cluster System

Author: ZhangYongHui
Tutor: JiYang
School: Beijing University of Posts and Telecommunications
Course: Communication and Information System
Keywords: DHT Server cluster Load balancing Virtual node algorithm one-hop DHT
CLC: TP393.05
Type: Master's thesis
Year: 2011
Downloads: 64
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Abstract


With the rapid development of Internet , network bandwidth and computer data processing capabilities , DHT ( Distributed Hash Table ) server cluster (Cluster Server) technology is more and more a matter of public concern . A typical application scenarios the P2PSIP server clusters , distributed IMS system , distributed DSN system . Load balancing the DHT server cluster system . The general DHT network often there are O (logN) load imbalance degrees . The traditional load balancing algorithm does not take full account of the particularity of the DHT server cluster to achieve load balancing effect is limited . In this paper, a load balancing algorithm applied to a the DHT server cluster system , the algorithm relative to the previous load balancing algorithm can achieve better load balancing effect , and has a smaller overhead of the algorithm . The main work of this paper include the following sections : 1 , proposed new virtual node routing node program to reduce maintenance overhead . In this paper, as the node ID routing maintenance functions and data storage functions were separated . With this improvement , the system, each node only needs to maintain a single routing table and neighbor node table , and greatly reduce the overhead of route maintenance . 2 , proposed to specify the virtual ID generation scheme in order to achieve better load balancing . The program generated virtual ID more purposeful , targeted , through simulation and actual system testing show that the scheme has better load balancing performance and smaller resources move overhead . 3 , to achieve a the DHT server cluster system BLESS, and text in the load balancing algorithm performance test analysis . BLESS overall structure of the system as well as an important module design are described in detail , and we design the load balancing algorithm performance , the analysis of the actual test . In summary, this paper proposed load balancing algorithm applies to the DHT server cluster system in the algorithm fully consider the characteristics of application scenarios , to achieve good load balancing effect , as well as smaller algorithm overhead compared to traditional algorithm better performance. This article from the simulation and implementation of two aspects of the performance of the algorithm analysis and validation , fully ensure the availability and reliability of the algorithm .

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