Decentralized resource management for a distributed continuous media server

Abstract

AbstractÐDistributed continuous media server (DCMS) architectures are proposed to minimize the communication-storage cost for those continuous media applications that serve a large number of geographically distributed clients. Typically, a DCMS is designed as a pure hierarchy (tree) of centralized continuous media servers. In an earlier work, we proposed a redundant hierarchical topology for DCMS networks, termed RedHi, which can potentially result in higher utilization and better reliability over pure hierarchy. In this paper, we focus on the design of a resource management system for RedHi that can exploit the resources of its DCMS network to achieve these performance objectives. Our proposed resource management system is based on a fully decentralized approach to achieve optimal scalability and robustness. In general, the major drawback of a fully decentralized design is the increase in latency time and communication overhead to locate the requested object. However, as compared to the typically long duration and high resource/ bandwidth requirements of continuous media objects, the extra latency and overhead of a decentralized resource management approach become negligible. Moreover, our resource management system collapses three management tasks, 1) object location, 2) path selection, and 3) resource reservation, into one fully decentralized object delivery mechanism, reducing the latency even further. In sum, decentralization of the resource management satisfies our scalability and robustness objectives, whereas collapsing the management tasks helps alleviate the latency and overhead constraints. To achieve a high resource utilization, the object delivery scheme uses our proposed cost function, as well as various object location and resource reservation policies to select and allocate the best streaming path to serve each request. The object delivery scheme is designed as an application layer resource management middleware for the DCMS architecture to be independent of the underlying telecommunication infrastructure. Our experiments show that our resource management system is successful in realization of the higher resource utilization for the DCMS networks with the RedHi topology.Index TermsÐDistributed continuous media servers, decentralized resource management, distributed multimedia systems, content delivery networks, distributed information systems, video-on-demand.

Load management in a distributed multimedia streaming environment using a fault-tolerant hierarchical system

“…A simple schematic representation of the system is depicted in Figure 1. Redundant hierarchy (Red-HI) [13] is used to connect the servers in each layer to their parents in the adjacent layer. …”

“…It is assumed that the following are provided for the policy to work: -All nodes have exactly two parent nodes based on Red-HI [13].…”

“…There are no connections between the servers of the same layer. The network architecture used is based on Red-HI [13].…”

“…This gives a higher degree of connectivity and it is a solution to the bottleneck problem. This also provides continued service provision in face of node/link failures [13].…”

“…Of the many services, interactive VoD has received the attention of many researchers because of the popularity of this service [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. It is expected that a large-scale VoD system would serve thousands if not millions of clients.…”