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ADAPTING A PURE DECENTRALIZED PEER-TO-PEER PROTOCOL FOR GRID SERVICES INVOCATION

DOMENICO TALIA

DEIS, University of Calabria, Via Pietro Bucci 41c, Rende (CS), 87036, Italy

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and

PAOLO TRUNFIO

DEIS, University of Calabria, Via Pietro Bucci 41c, Rende (CS), 87036, Italy

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https://doi.org/10.1142/S0129626405002064Cited by:4 (Source: Crossref)

Abstract

Several aspects of today's Grids are based on centralized or hierarchical services. However, as Grids increase their size from tens to thousands of hosts, functionalities should be decentralized to avoid bottlenecks and guarantee scalability. A way to ensure Grid scalability is to adopt Peer-to-Peer (P2P) models and techniques to implement non-hierarchical decentralized Grid services and systems. Pure decentralized P2P protocols based on a pervasive exchange of messages, such as Gnutella, appear to be inadequate for OGSA Grids, where peers communicate among them through Grid Services mechanisms. On the other hand, this class of protocols offers useful properties in dealing with Grid resources heterogeneity and dynamicity. This paper proposes a modified Gnutella discovery protocol, named Gridnut, which makes it suitable for OGSA Grids. In particular, Gridnut uses appropriate message buffering and merging techniques to make Grid Services effective as a way to exchange messages in a P2P fashion. We present the design of Gridnut and compare Gnutella and Gridnut performances under different network and load conditions.

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