The peer-to-peer (P2P) style interaction [1] model facilitates sophisticated resource sharing environments between ‘consenting’ peers over the ‘edges’ of the Internet; the ‘disruptive’ [2] impact of which has resulted in a slew of powerful applications built around this model. Resources shared could be anything – from CPU cycles, exemplified by SETI@home (extraterrestrial life) [3] and Folding@home (protein folding) [4] to files (Napster and Gnutella [5]). Resources in the form of direct human presence include collaborative systems (Groove [6]) and Instant Messengers (Jabber [7]) | 22 NaradaBrokering an event-based infrastructure for building scalable durable peer-to-peer Grids Geoffrey Fox and Shrideep Pallickara Indiana University Bloomington Indiana United States INTRODUCTION The peer-to-peer P2P style interaction 1 model facilitates sophisticated resource sharing environments between consenting peers over the edges of the Internet the disruptive 2 impact of which has resulted in a slew of powerful applications built around this model. Resources shared could be anything - from CPU cycles exemplified by SETI@home extraterrestrial life 3 and Folding@home protein folding 4 to files Napster and Gnutella 5 . Resources in the form of direct human presence include collaborative systems Groove 6 and Instant Messengers Jabber 7 . Peer interactions involve advertising resources search and subsequent discovery of resources request for access to these resources responses to these requests and exchange of messages between peers. An overview of P2P systems and their deployments in distributed computing and Grid Computing - Making the Global Infrastructure a Reality. Edited by F. Berman A. Hey and G. Fox 2003 John Wiley Sons Ltd ISBN 0-470-85319-0 580 GEOFFREY FOX AND SHRIDEEP PALLICKARA collaboration can be found in Reference 8 . Systems tuned towards large-scale P2P systems include Pastry 9 from Microsoft which provides an efficient location and routing substrate for wide-area P2P applications. Pastry provides a self-stabilizing infrastructure that adapts to the arrival departure and failure of nodes. FLAPPS 10 a Forwarding Layer for Application-level Peer-to-Peer Services is based on the general peer internetworking model in which routing protocols propagate availability of shared resources exposed by remote peers. File replications and hoarding services are examples in which FLAPPS could be used to relay a source peer s request to the closest replica of the shared resource. The JXTA 11 from juxtaposition project at Sun Microsystems is another .
