Support Mobility with Persistent Notifications in Publish/Subscribe Systems Ivana Podnar and Ignac Lovrek   View Paper (PDF)   Return to Short Presentations Abstract The paper proposes a novel approach to mobility in publish/subscribe (pub/sub) systems that relies on notification persistency. The existing solutions apply proxy subscribers that take the role of disconnected subscribers, store notifi- cations published during disconnections, and deliver them to subscribers after reconnection to the pub/sub system. The system perceives a constant number of subscribers which is inefficient if it serves a large number of subscribers that are often disconnected. We argue that the system should not be burdened by proxy subscribers during subscriber disconnections, but rather store persistent notifications, and deliver valid notifications to subscribers when they reconnect to the system. We show that the proposed solution resolves the observed scalability weakness of the existing solutions. ©2005 Association for Computing Machinery