Design of QoS-aware Provisioning Systems

TL;DR

This paper proposes a QoS-aware hosting system architecture for web services that dynamically manages server resources and admission control to optimize revenue while meeting SLAs, demonstrating robustness under session-based traffic.

Contribution

It introduces a novel architecture with dynamic resource management and admission control for QoS-aware web hosting, validated through empirical evaluation.

Findings

The system effectively manages session-based traffic under various conditions.

Dynamic resource allocation improves revenue and QoS adherence.

The approach is robust across different traffic scenarios.

Abstract

We present an architecture of a hosting system consisting of a set of hosted Web Services subject to QoS constraints, and a certain number of servers used to run users demand. The traffic is session-based, while provider and users agree on SLAs specifying the expected level of service performance such that the service provider is liable to compensate his/her customers if the level of performance is not satisfactory. The system is driven by a utility function which tries to optimize the average earned revenue per unit time. The middleware collects demand and performance statistics, and estimates traffic parameters in order to make dynamic decisions concerning server allocation and admission control. We empirically evaluate the effects of admission policies, resource allocation and service differentiation schemes on the achieved revenues, and we find that our system is robust enough to successfully deal with session-based traffic under different conditions.