Research On Technology Of Distributed Proxy Cache Based On Self-decision

With the development of IT, the Internet has in-depth to all aspects of people’slife. At the same time, various web services began to rapid growth. However, thehuge network traffic has caused network congestion between users, and results inthe decrease of network quality of service and user experience. Internet ServiceProvider needs a kind of technology to reduce network traffic load and service delaytime. Since the HTTP traffic has a high percentage of total network traffic, HTTPproxy caching techniques can not only effectively solve above problems, but alsoreduces network traffic load. In order to meet the massive traffic, the distributedproxy cache system appeared, and the performance of this system depends on thecache management technique. For achieving high-efficiency and automated cachemanagement, this paper proposes the mechanism of proxy cache management basedon self-decision, and self-awareness and self-decision are introduced to thismechanism.At first, self-management model and proxy cache management methods basedon self-decision are introduced, and built the self-management framework accordingto the idea of feedback loop. Then, the mechanism of distributed proxy cachemanagement based on self-decision is proposed. In order to analyze the monitoritems and identifying the state, the weighted average method based on correlationcoefficient is proposed. In order to uniformly distribute URL space between cachenodes, the mechanism of hash ring with virtual node is proposed. In order to selectthe cache nodes need to be adjusted, sequence interval constraint classificationmethod is proposed. In order to calculate how to adjust cache node, the state adjuststrategy based on historical states sequence and grey forecasting model is proposed.In order to move the heated URL and reduce the load of cache node, the method ofevaluating content heat based on domain polymerization is proposed. Next,depending on self-management framework of proxy cache, the distributed proxycache management is designed by using self-decision mechanism, and CHSM (Cache Hot Spots Migrate) algorithm is proposed to implement dynamic migrationand fusion of virtual nodes in the hash ring. The system knowledge database isconstructed by using the states sequence and the adjustment strategy. Finally,according to analyze the experimental results of hash ring, content heat evaluationand self-decision adjustment of cache state, it indicates that distributed proxy cachemanagement mechanism based on the decision can efficiently and automaticallymanage cache nodes, and improve the overall performance of system.