A Model-based Approach for Effective Service Delivery

TL;DR

This paper introduces a systematic model-based framework for ensuring Quality of Service in service delivery, emphasizing real-time monitoring and dynamic scaling within a PaaS prototype.

Contribution

It proposes a novel decomposition of services into components, models for each, and operations for publishing and composition, advancing QoS assurance methods.

Findings

Prototype system demonstrates real-time QoS monitoring

Dynamic scaling effectively maintains service quality

Framework supports systematic service composition

Abstract

With the prevalence of X-as-a-Service (e.g., software as a service, platform as a service, infrastructure as a service, etc.) and users' growing demand on good services, QoS (Quality of Service) assurance is becoming increasingly important to service delivery. Traditional service delivery mainly focuses on function or information provisioning, and does not give high priority to quality assurance. In this paper, we tackle the QoS assurance problem in a systematic way, from model to system. We first decompose traditional services into three components - namely software application, data and resource, then define models for these three kinds of basic services, and propose a set of operations for service publishing and composition. To illustrate our approach, we present a prototype system, the Platform as a Service (PaaS) system, which is developed in support of our framework and shows how QoS can be ensured through real-time monitoring and dynamic scaling (up or down).