From P2P to Web services and grids: peers in a client/server by Ian J. Taylor

By Ian J. Taylor

ÄPeers In a consumer Server internationalô presents a entire evaluation of rising peer-to-peer (P2P) applied sciences that experience revolutionized the way in which we predict approximately allotted computing and the web. those applied sciences are in comparison to replacement ideas, so much particularly internet prone and Grid computing but in addition different applied sciences, similar to client/server dependent structures and agent applied sciences. a variety of diversified middleware and application-based applied sciences are lined, reminiscent of JXTA, Jini, Globus, net prone, OGSA, J2EE, Napster and Gnutella, with an emphasis given at the structure hired and safety version selected. every one know-how and its features are analyzed within the context of the measure of centralization or decentralization they hire. A ensuing taxonomy is created that provides the reader a context during which to contemplate the main complex and huge ranging allotted platforms on hand this day, and offers them with an important reference textual content for designing new allotted structures.

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Google, for example, relies on a central database that is updated daily by scouring the Internet for new information. 6 billion entries) not every entry gets updated every day, and as a result, information can often be out of date. Further, it is impractical (from a cost perspective) that such solutions will be scalable for the future Internet. 3 x 108 ) to create its database. e. 2 The P2P Environment 31 one byte gets published. Therefore, finding useful information in real-time is becoming increasingly difficult.

2 NAT Systems For a computer to communicate with other computers and Web servers on the Internet, it must have an IP address. An IP address is a unique 32-bit number that identifies the location of your computer on a network. 3 billion). This is due to the way that the addresses are separated into classes and also because some are set aside for multicasting, testing or other special uses. With the explosion of the Internet and the increase in home networks and business networks, the number of available IP addresses is simply not enough.

2 below). Often the number of computers in a P2P network is enormous consisting of millions of interconnecting peers. This modern definition rather defines the P2P environment of devices and resources rather than previous definitions that focused on the servent methodology and decentralized nature of systems like Gnutella [6]. e. ) • The network is completely decentralized and has no central point of control. Peers in a Gnutella network are typically connected to three or four other nodes and to search the network a query is broadcast throughout the network.

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