scooped - Scooped, Again Jonathan Ledlie, Jeff Shneidman,...

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Scooped, Again Jonathan Ledlie, Jeff Shneidman, Margo Seltzer, John Huth Harvard University jonathan,jeffsh,margo Abstract The Peer-to-Peer (p2p) and Grid infrastructure commu- nities are tackling an overlapping set of problems. In ad- dressing these problems, p2p solutions are usually moti- vated by elegance or research interest. Grid researchers, under pressure from thousands of scientists with real file sharing and computational needs, are pooling their solu- tions from a wide range of sources in an attempt to meet user demand. Driven by this need to solve large scientific problems quickly, the Grid is being constructed with the tools at hand: FTP or RPC for data transfer, centraliza- tion for scheduling and authentication, and an assump- tion of correct, obediant nodes. If history is any guide, the World Wide Web depicts viscerally that systems that address user needs can have enormous staying power and affect future research. The Grid infrastructure is a great customer waiting for future p2p products. By no means should we make them our only customers, but we should at least put them on the list. If p2p research does not at least address the Grid, it may eventually be sidelined by defacto distributed algorithms that are less elegant but were used to solve Grid problems. In essense, we’ll have been scooped, again. 1 Introduction Butler Lampson, in his SOSP99 Invited Talk, stated that the greatest failure of the systems re- search community over the past ten years was that “we did not invent the Web” [39]. The systems research community laid the groundwork, but did not follow through. The same situation exists to- day with the overlapping efforts of the Grid and p2p communities. The former is building and using a global resource sharing system, while the latter is repeating their mistake of the past by focusing on elegant solutions without regard to a vast potential user community. In 1989, Tim Berner-Lee’s need to communicate Users p2p Grid Users (scientists) App. writers (e.g., OGSA) writers} App. writers Infrastructure writers Infrastructure writers ( disparate groups ) users place demand on research and development demand demand Figure 1: In serving their well-defined user base, the Grid community has needed to draw from both its ances- try of supercomputing and from Systems research (in- cluding p2p and distributed computing). P2p has essen- tially invented its user base through its technology. his own work and the work of other physicists at CERN led him to develop HTML, HTTP, and a sim- ple browser [4]. While HTTP and HTML are simple, they have exhibited serious network and language-based defi- ciencies as the Web has grown [21]. These problems have been examined and patched to some extent, but this simple inelegant solution remains at the core of the Web. A parallel situation exists today with the p2p and
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This note was uploaded on 12/08/2011 for the course CS 525 taught by Professor Gupta during the Spring '08 term at University of Illinois, Urbana Champaign.

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scooped - Scooped, Again Jonathan Ledlie, Jeff Shneidman,...

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