A web load distribution system : implementation and evaluation with PlanetLab

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  • Web負荷自律分散システム : PlanetLabによる実装と評価

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Abstract

The Internet increases its popularity and evolves largely. The lack of a central coordination is a critically important problem to the rapid growth and evolution of the Internet. The lack of management makes it very difficult to guarantee the web servers keep proper performance and to deal systematically with performance problems. Meanwhile, the available network bandwidth and server capacity continue to be overwhelmed by the accelerating growth of the Internet utilization. When a web server is under a heavy load, its performance suffers, and it may even crash, which caused customers feel largely inconvenient and unsatisfactory. To avoid the web server performance problems caused by high load, a few methods and systems have been proposed. But, some of them are commercial, and some of them cannot solve the problem well. We think that distributing its load to other servers that are not busy is a solution for the problem. In this research, we propose a web load distribution system made by a network technology that can distribute the web load from the web server to other servers automatically, when the web server is in high loads. We implement the system on PlanetLab, which is a free global research network that supports the development of new network services. Then we evaluate the system in two cases. Based on the evaluation results, we have learned that the HTTP response delay was reduced. So we verified that this technology can distribute the web server load so that users can access their web servers faster during high load time.

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