A client-controlled adaptation framework for multimedia database systems

Hollfelder, Silvia; Kraiss, Achim; Rakow, Thomas C.

doi:10.1007/bfb0000370

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…Strategic adaptation can be initiated from the perspective of any MC participating in the session. Hence, the management structure accommodates adaptation initiated by any MC including client-initiated adaptation [24].…”

Section: Adaptation Managementmentioning

confidence: 99%

Dynamic end-to-end QoS management middleware for distributed multimedia systems

et al. 2002

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Abstract. In this paper, we present a separable, reusable middleware solution that provides coordinated, end-to-end QoS management over any type of service component, and can use existing (legacy) QoS management solutions (by using wrappers) in a distributed multimedia system. Our middleware solution incorporates strategic and tactical QoS managers, and supports protocols and messages between tactical managers and managed application components, and between QoS managers in the management hierarchy. Strategic QoS managers take a global view of QoS provided by a set of application components within the manager's policy domain. Tactical QoS managers provide local control over application components. We introduce the concept of QoS policy domains to scope the authority of a strategic QoS manager. We describe how the management hierarchy is dynamically configured and reconfigured based on runtime needs of the application.

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Section: Adaptation Managementmentioning

confidence: 99%

Dynamic end-to-end QoS management middleware for distributed multimedia systems

et al. 2002

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“…If the admission control is based on a stochastic model, then this inequality holds with very high probability. In the unlikely event that glitches are inevitable, smoothful degradation policies can be devised along the lines of [9,24].…”

Section: Number Limitmentioning

confidence: 99%

Incremental Scheduling of Mixed Workloads in Multimedia Information Servers

Nerjes

Muth

Paterakis

et al. 2000

Continuous Media Databases

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In contrast to pure video servers, advanced multimedia applications such as digital libraries or teleteaching exhibit a mixed workload with massive access to conventional, "discrete" data such as text documents, images and indexes as well as requests for "continuous data", like video and audio data. In addition to the service quality guarantees for continuous data requests, quality-conscious applications require that the response time of the discrete data requests stay below some user-tolerance threshold. In this paper, we study the impact of different disk scheduling policies on the service quality for both continuous and discrete data. We provide a framework for describing various policies in terms of few parameters, and we develop a novel policy that is experimentally shown to outperform all other policies. . Currently, Prof. Triantafillou's research focuses in the area of highperformance, intelligent storage systems, including disk drives, disk arrays, and robotic tape/disk libraries, with a special emphasis on multimedia applications. His research activities in the past have focused on multidatabases, distributed file systems, and highly-available distributed databases. Prof. Triantafillou has served in the Program Committees of the ACM MobiDE '99, ACM SIGMOD '99, FODO '98, RIDE '98, and EDBT '98 international conferences and as a reviewer in most relevant international journals.Gerhard Weikum received the diploma degree (where he is leading a research group on database systems. His former affiliations include MCC at Austin, Texas, and ETH Zurich in Switzerland. During his sabbatical in 1997, he was a visiting Senior Researcher in the database research group of Microsoft. Dr. Weikum's research interests include parallel and distributed information systems, transaction processing and workflow management, and database optimization and performance evaluation. Dr. Weikum serves on the editorial boards of ACM Transactions on Database Systems, The VLDB Journal, and the Distributed and Parallel Databases Journal. He has served on numerous program committees of international conferences, he was the program committee co-chair of the 4th International Conference on Parallel and Distributed Information Systems, and he is the program committee co-chair of the 16th IEEE International Conference on Data Engineering. Dr. Weikum has been elected onto the board of trustees of the VLDB Endowment.

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“…With adaptation the required data volume is reduced by modifying the quality of the delivered data in the temporal and/or spatial dimension. For example, it is possible to modify the resolution of a video or audio, or drop frames of a video [9]. When the server decides to adapt it has the responsibility to reduce the data rate and deliver the data with reduced quality in a way such that the client is able to interpret the returned data, which then deviates from its original request.…”

Section: Scheduling Policies For Data Requestsmentioning

confidence: 99%

An Admission Control Framework for Applications with Variable Consumption Rates in Client-Pull Architectures

Hollfelder¹,

Aberer²

1998

Advances in Multimedia Information Systems

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Abstract. Highly interactive multimedia applications require variable data rates during their presentation. Current admission control mechanisms do not address the variable data rate requirements appropriately for the following reasons: (1) classical admission control mechanisms are based on the server-push approach, where the required data rate has to be estimated in advance, and (2) worst-case resource reservation is not economic. Client-pull models are more appropriate to serve these kinds of applications. At the current state, there are no suitable mechanisms that support admission control in client-pull architectures at the server. In this paper, a session-oriented framework for admission control is introduced that is based on two steps: (1) the admission of new clients and (2) the scheduling of the single requests of admitted clients to balance the load. The goal of this approach is to improve the server utilization and the Quality of Service. Evaluation studies demonstrate the benefit of the framework.

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A client-controlled adaptation framework for multimedia database systems

Cited by 14 publications

References 15 publications

Dynamic end-to-end QoS management middleware for distributed multimedia systems

Dynamic end-to-end QoS management middleware for distributed multimedia systems

Incremental Scheduling of Mixed Workloads in Multimedia Information Servers

An Admission Control Framework for Applications with Variable Consumption Rates in Client-Pull Architectures

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