Handling churn in DHT-based Publish/Subscribe systems

In a Publish/Subscribe (Pub/Sub) system mainly used with event stream processing, churn represents a signifiant risk when brokers of the event service are dynamic enough and maintain full subscription table at the same time. Brokers would not be enabling to route received publications to interested subscribers when one or several intermediate brokers in the path to the subscribers are absent. In this paper, we treat the churn challenge in peer-to-peer-based pub/sub systems. Our proposed approach replicates subscriptions efficiently by improving the success rate of publication delivery while minimizing the message traffic. The experimental results proving the efficiency of the proposed approach are reported.