An Effective Request Distribution Mechanism For Improving Load Balance in Web Server System

Abstract

In this paper, we propose an effective request distribution mechanism called Probabilistic Dispatching with Content Adapted (PDCA) method for improving load balance in web server system. Using predicted document popularity to adjust the number of replicas, we place the documents among servers by our data placement scheme. The dispatcher distributes a request according to dispatching probability of the requested document. In order to reduce the impacts on burst traffic, servers may transmit adapted documents to requests. This method can support load balance and ensure QoS of overloaded servers. According to preliminary performance evaluations, we have found that our method is superior to other schemes especially for massive traffic. The detailed information about design concept and performance evaluations will be described in the literature.