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Journal ArticleDOI

QoS issues in Web services

Daniel A. Menascé
- 01 Nov 2002 - 
- Vol. 6, Iss: 6, pp 72-75
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TLDR
QoS measures can include the maximum throughput or a function that describes how throughput varies with load intensity, which can be measured in terms of arrival rates (such as requests per second) or number of concurrent requests.
Abstract
Quality of service (QoS) is a combination of several qualities or properties of a service, such as: availability is the percentage of time that a service is operating; security properties include the existence and type of authentication mechanisms the service offers, confidentiality and data integrity of messages exchanged, nonrepudiation of requests or messages, and resilience to denial-of-service attacks; response time is the time a service takes to respond to various types of requests; Response time is a function of load intensity, which can be measured in terms of arrival rates (such as requests per second) or number of concurrent requests. QoS takes into account not only the average response time, but also the percentile of the response time; and throughput is the rate at which a service can process requests. QoS measures can include the maximum throughput or a function that describes how throughput varies with load intensity. The QoS measure is observed by Web services users. These users are not human beings but programs that send requests for services to Web service providers. QoS issues in Web services have to be evaluated from the perspective of the providers of Web services and from the perspective of the users of these services.

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Citations
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Resilience-Building Technologies: State of Knowledge -- ReSIST NoE Deliverable D12

TL;DR: A new technique that is tailored to the characteristic of a large class of distributed protocols, where the state of the system is represented as a tuple of states, one for each process, leading to a considerable reduction of the size of the state space.
Proceedings ArticleDOI

Web Service Selection Based on Credible User Recommended and QoS

TL;DR: A web service selection method based on credible user recommended and QoS solved the service choice blindness and trust shortage, and effectively improved the reliability and accuracy of the service selection.
Journal ArticleDOI

Service-level agreement-based QoS analysis for web services discovery and composition

TL;DR: A QoS-aware model is developed, which contains a common set of QoS attributes including response time, throughput, reliability, availability and price etc, and two alternative service selection methods, namely absolute and relative matchmaking are presented.
Proceedings ArticleDOI

A Fault Tolerant Web Service Architecture

TL;DR: The goal of this paper is to propose a fault tolerant Web service architecture that provides service mediation and monitoring and the use of Web service standards to include fault tolerance in theWeb service architecture.
Journal ArticleDOI

Scheduling Periodic Continuous Queries in Real-Time Data Broadcast Environments

TL;DR: A novel measure is proposed, called Bandwidth Utilization, to quantify the minimum bandwidth demand of a periodic continuous query set, and an efficient online scheduling algorithm, called RM-UO, is developed, which can fulfill the timing constraints combined with the proposed query release and deletion policies.
References
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Journal ArticleDOI

Unraveling the Web services web: an introduction to SOAP, WSDL, and UDDI

TL;DR: This tutorial explores the most salient and stable specifications in each of the three major areas of the emerging Web services framework, which are the simple object access protocol, the Web Services Description Language and the Universal Description, Discovery, and Integration directory.
Journal ArticleDOI

Session-based admission control: a mechanism for peak load management of commercial Web sites

TL;DR: It is shown that a Web server augmented with the admission control mechanism is able to provide a fair guarantee of completion, for any accepted session, independent of a session length, which is a critical requirement for any e-business.
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