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Internet Web Hosting Dynamic Replication Schemes Performance

The paper explores schemes for vigorous replica and migration of web objects in the condition of an Internet hosting service. It describes a replica agreement algorithm for deciding the stance and sum of replicas of an objective as well as request distribution schemes for choosing among currently available replicas. We compare two classes of request distribution algorithms -- namely feedback and non-feedback based. Further, we compare vigorous replica to a static replica scheme.

Many large web sites get more than 100 million hits everyday. They need a scalable web server system that can provide better performance to all the clients that may be in different geographical regions. Higher delays and losses are common on WAN links. To provide a better service to all the clients, it is natural to have fully replicated web server clusters in different geographical regions.

In such an environment, one of the most important issues is that of server selection (and load balancing). It includes fundamental libraries (API s) using which a plenty of interfaces have to be implemented by the user according to the policy he is submitting. We will now describe each of these parts and their implementations one by one. It has however been modified for our objective and these modifications are included.

The Original Test Bed Setup The load balancing mechanisms have their comparative pros and cons and it is not easy to indicate the superiority of the one over another. To compare various policies for Client Browsers HTTP Apache Tomcat Web Server Java Servlets App Logic JDBC MySQL Database Server Backend Original Test Bed Setup Web service to analyze canvas interaction module. API for New Policies request distribution at server stance, a testing canvas was designed and implemented by Puneet et al. , which tries to emulate real network scenarios and implements an exceedingly configurable web server system which can be configured to go a sort of load balancing policies. All fundamental components used in the Internet are used in this tested, for example, BIND (Berkeley Internet Domain Name Server) internet evolves and operates largely without an important coordination, the inadequacy of which was and is critically substantial to the rapid growth and growth of Internet.

However, the inadequacy of management in spin makes it truly heavily to guarantee proper procedure and to deal consistently with procedure problems. Meanwhile, the available network bandwidth and waiter capacity stay to be overwhelmed by the skyrocketing Internet utilization and the accelerating growth of bandwidth fierce. How documents of a Web site are replicated and where they are placed among the server nodes have an important bearing on balance of load in a geographically Distributed Web Server (DWS) system. The traffic generated due to movements of documents at runtime could also affect the performance of the DWS system.

In this paper, we prove that minimizing such traffic is NPhard. We propose a new document distribution scheme that periodically performs partial replication of a site's documents at. The weight of each server is proportional to its load capacity.

Based on these constraints, we constructed an optimization problem whose objective function is to minimize the total communication costs needed to update the document distribution. This problem was proved to be NP complete. A replica placement that fulfills all the constraints is a feasible placement.

However, because of constraint (3) an instance of this optimization problem does not necessarily have a feasible solution. Therefore, in practical document distribution, we relax the constraint (3).

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