A framework for P2P application development

Although Peer-to-Peer (P2P) computing has become increasingly popular over recent years, there still exist only a very small number of application domains that have exploited it on a large scale. This can be attributed to a number of reasons including the rapid evolution of P2P technologies, coupled with their often-complex nature. This paper describes an implemented abstraction framework that seeks to aid developers in building P2P applications. A selection of example P2P applications that have been developed using this framework are also presented

Performance Analysis of Publish/Subscribe Systems

The Desktop Grid offers solutions to overcome several challenges and to answer increasingly needs of scientific computing. Its technology consists mainly in exploiting resources, geographically dispersed, to treat complex applications needing big power of calculation and/or important storage capacity. However, as resources number increases, the need for scalability, self-organisation, dynamic reconfigurations, decentralisation and performance becomes more and more essential. Since such properties are exhibited by P2P systems, the convergence of grid computing and P2P computing seems natural. In this context, this paper evaluates the scalability and performance of P2P tools for discovering and registering services. Three protocols are used for this purpose: Bonjour, Avahi and Free-Pastry. We have studied the behaviour of theses protocols related to two criteria: the elapsed time for registrations services and the needed time to discover new services. Our aim is to analyse these results in order to choose the best protocol we can use in order to create a decentralised middleware for desktop grid

The design and implementation of a P2P-based composite event notification system

The development of large, open, and heterogeneous distributed systems is becoming increasingly dependent on event services to bind together the components of an application in such a way that they are able to react to changes in other components. One way to distribute event notifications around a distributed environment is to use content-based publish/ subscribe communication. Such a system mediates between publishers of information and subscribers who sign up to receive information by routing messages across the network from their source to the point of subscription using the message content and the client subscriptions. Although content-based publish/subscribe has been used successfully to develop simple event notification systems, in which events are routed through from external publisher to external client, more complex systems are possible that create new events, known as composites, based on the detection of patterns of events. Composite event notification, however, poses a number of challenges, including network management and network routing. In this paper, we discuss the design and implementation of a composite event notification system over a Chord-based peer-to-peer network using JXTA, and how we have addressed these challenges

Data Management in the APPA System

International audienceCombining Grid and P2P technologies can be exploited to provide high-level data sharing in large-scale distributed environments. However, this combination must deal with two hard problems: the scale of the network and the dynamic behavior of the nodes. In this paper, we present our solution in APPA (Atlas Peer-to-Peer Architecture), a data management system with high-level services for building large-scale distributed applications. We focus on data availability and data discovery which are two main requirements for implementing large-scale Grids. We have validated APPA's services through a combination of experimentation over Grid5000, which is a very large Grid experimental platform, and simulation using SimJava. The results show very good performance in terms of communication cost and response time