A framework for performance monitoring, load balancing, adaptive timeouts and quality of service in digital libraries
Authors: Kapidakis, Sarantos 
Terzis, Sotirios 
Sairamesh, J. 
Issue Date: 1-Jul-2000
Journal: International Journal on Digital Libraries 
Volume: 3
Issue: 1
Keywords: Adaptive timeouts, Dienst servers, Load balancing, NCSTRL, Performance management, Quality of service
Abstract: 
In this paper, we investigate the issues of performance management in large scale, autonomous and federated digital library systems, performing the tasks of indexing, searching and retrieval of information objects. We have defined a management architecture and performance framework for measuring and monitoring the behavior of digital libraries as they operate. Our architecture and mechanisms are easily applicable to other digital library systems of similar flavor and architecture. We implemented this architecture over a testbed of Dienst servers using real data and workload from the operational NCSTRL system. We have defined the relevant parameters for investigating the performance of the servers and have developed visualization tools to monitor the parameters. In addition, our performance framework provides mechanisms for load-balancing search requests in a network of digital library servers. We have demonstrated this by building a testbed for investigating a few novel load balancing policies. Given that network delays and outages are unpredictable over the Internet, we have developed new adaptivemechanisms to detect timeouts and provide quality of service.
ISSN: 14321300
14325012
DOI: 10.1007/pl00021473
URI: https://uniwacris.uniwa.gr/handle/3000/426
Type: Article
Department: Department of Archival, Library and Information Studies 
School: School of Administrative, Economics and Social Sciences 
Affiliation: University of West Attica (UNIWA) 
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