On-Demand Multimedia Server Clustering Using Dynamic Content Replication
نویسنده
چکیده
This thesis examines the provision of on-demand multimedia streaming services using clusters of commodity PCs. In the proposed HammerHead multimedia server cluster architecture, a dynamic content replication policy is used to assign non-disjoint subsets of the presentations in a multimedia archive to cluster nodes. Replicas of selected presentations can be created on more than one node to achieve load-balancing, increase performance or increase service availability, while avoiding complete replication of a multimedia archive on every node. Since the relative demand for the presentations in a multimedia archive will change over time, the assignment of presentations to nodes must be periodically reevaluated. A group communication system is used by the HammerHead architecture to implement a cluster-aware layer, which maintains the aggregated state of the commodity stand-alone multimedia server on each cluster node. The aggregated cluster state is used to redirect client requests to specific nodes and to implement the dynamic content replication policy. By replicating the aggregated cluster state on each node, the client redirection task can be shared and the implementation of the dynamic replication policy can tolerate multiple node failures. The HammerHead architecture proposed in this thesis is the first multimedia server cluster architecture to combine the use of group communication with the implementation of a dynamic replication policy. The Dynamic RePacking content replication policy, which has been used in the prototype HammerHead server cluster, is a significant improvement of the existing MMPacking replication policy. Dynamic RePacking separates replication to achieve
منابع مشابه
Dynamic Replication of Content in the Hammerhead Multimedia Server
In a clustered multimedia server, by periodically evaluating client demand for each file and performing selective replication of those files with the highest demand, the files can be distributed among server nodes to achieve load balancing. This technique is referred to as dynamic replication. Several dynamic replication policies have been proposed in the past, but to our knowledge, our work is...
متن کاملDynamic RePacking: A Content Replication Policy for Clustered Multimedia Servers
Dynamic replication is a technique that can be used by clustered multimedia servers to evaluate the demand for individual streams and selectively replicate or move content to facilitate load balancing. In this paper we explain the motivation for using dynamic replication and provide a brief description of some existing dynamic replication policies. We present a new policy called Dynamic RePacki...
متن کاملAn Efficient Algorithm for Clustering Nodes, Classifying and Replication of Content on Demand Basis for Content Distribution in P2p Overlay Networks
This paper proposes an efficient algorithm for clustering nodes, classifying and replication of content on demand basis for content distribution in p2p overlay networks. Peer-to-peer overlay networks are a good solution for distributed computing than client-server model since nodes in P2P networks act both as client and server. With such functionality of managing replicas is an astonishing task...
متن کاملبهینهسازی اجرا و پاسخ صفحات وب در فضای ابری با روشهای پیشپردازش، مطالعه موردی سامانههای وارنیش و انجینکس
The response speed of Web pages is one of the necessities of information technology. In recent years, renowned companies such as Google and computer scientists focused on speeding up the web. Achievements such as Google Pagespeed, Nginx and varnish are the result of these researches. In Customer to Customer(C2C) business systems, such as chat systems, and in Business to Customer(B2C) systems, s...
متن کاملImprove Replica Placement in Content Distribution Networks with Hybrid Technique
The increased using of the Internet and its accelerated growth leads to reduced network bandwidth and the capacity of servers; therefore, the quality of Internet services is unacceptable for users while the efficient and effective delivery of content on the web has an important role to play in improving performance. Content distribution networks were introduced to address this issue. Replicatin...
متن کامل