QoS-oriented multi-query scheduling over data streams

Abstract

Existing query scheduling strategies over data streams mainly focus on metrics in terms of system performance, such as processing time or memory overhead. However, for commercial stream applications, what actually matters most is the users' satisfaction about the Quality of Service (QoS) they perceive. Unfortunately, a system-oriented optimization strategy does not necessarily lead to a high degree of QoS. Motivated by this, we study QoS-oriented query scheduling in this paper. One important contribution of this work is that we correlate the operator scheduling problem with the classical job scheduling problem. This not only offers a new angle in viewing the issue but also allows techniques for the well studied job scheduling problems to be adapted in this new context. We show how these two problems can be related and propose a novel operator scheduling strategy inspired by job scheduling algorithms. The performance study demonstrates a promising result for our proposed strategy.