Optimizing the Quality of Service for a Publish/Subscribe System

Publish/Subscribe (Pub/Sub) systems are the middleware which provides the distributed event detection. The increasing requirements from applications have driven Pub/Sub systems to provide diversified quality of service (QoS). Therefore, this paper builds a Pub/Sub system Phoenix on the cloud which can meet the different needs of system reliability and user timeliness. In brief, Phoenix can deal with link failure, broker failure and cluster churning to guarantee that the system can run normally. Meanwhile, it provides the timeliness guarantee mechanism to manage to satisfy the timeliness specified by the users with its best effort. The experimental results show that Phoenix is fairly reliable and accommodates the users´ personalized timeliness requirements well.