By Arturo Crespo, Hector Garcia-Molina (auth.), Gianluca Moro, Sonia Bergamaschi, Karl Aberer (eds.)
Peer-to-peer (P2P) computing is attracting huge, immense media recognition, spurred through the recognition of dossier sharing platforms resembling Napster, Gnutella, and Morpheus. The friends are self sustaining, or as a few name them, firstclass voters. P2P networks are rising as a brand new dispensed computing paradigm for his or her strength to harness the computing strength of the hosts composing the community and make their under-utilized assets to be had to others. even supposing researchers engaged on allotted computing, multiagent platforms, databases and networks were utilizing related suggestions for a very long time, it is just lately that papers encouraged via the present P2P paradigm have all started showing in fine quality meetings and workshops. study in agent structures specifically seems to be such a lot suitable simply because, considering that their inception, multiagent platforms have consistently been considered networks of affiliates. The multiagent paradigm can therefore be superimposed at the P2P structure, the place brokers embrace the outline of the duty environments, the decision-support functions, the collective habit, and the interplay protocols of every peer. The emphasis during this context on decentralization, person autonomy, ease and pace of development that offers P2P its benefits additionally results in major capability difficulties. such a lot fashionable between those difficulties are coordination, the facility of an agent to make judgements by itself activities within the context of actions of different brokers, and scalability, the worth of the P2P structures lies in how good they scale alongside a number of dimensions, together with complexity, heterogeneity of affiliates, robustness, site visitors redistribution, and so on.
This quantity offers the totally revised papers awarded on the 3rd overseas Workshop on brokers and Peer-to-Peer Computing, AP2PC 2004, held in big apple urban on July 19, 2004 within the context of the 3rd foreign Joint convention on self sufficient brokers and Multi-Agent structures (AAMAS 2004). the quantity is geared up in topical sections on P2P networks and seek functionality, emergent groups and social behaviours, semantic integration, cellular P2P platforms, adaptive structures, agent-based source discovery, in addition to belief and reputation.
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Additional resources for Agents and Peer-to-Peer Computing: Third International Workshop, AP2PC 2004, New York, NY, USA, July 19, 2004, Revised and Invited Papers
G. to pop messages) over the network stream. If a connection is lost, the Gateway can restart the bootstrap process to ﬁnd a better node or try to connect directly to the Gateway again. Gateway commands are translated directly into queue operations which are then handled by the Reliable Queue Service. 3 Reliable Queue Service Queues are implemented as priority queues where the message timestamps denote priority. This provides a total ordering on messages given synchronized global clocks. Given weaker time synchronization, however, the priority queues still serve a purpose: they provide a consistent ordering of packets in replicated queues.
Recently a number of look up algorithms have evolved, [13,8,10,4], which use the Distributed Hash Table (DHT) approach. Chord  uses a DHT abstraction that forms an ordered logical ring structure. It offers the capability to perform a lookup in O(logN ) hops. A single node maintains information about O(logN ) other nodes. However Chord and other similar protocols like Tapestry, Pastry  and Yappers  do not provide for arbitrariness in queries. The effectiveness of caching and replication in such architectures is not significant since a data key always maps to a unique network node.
In this paper, groups and nodes are used interchangeably. Groups may also be referred to as an individual peer in the network and will be indicated as a network node. The total number of peers in the network at any point is referred to as the size of the network. 4 DiST Architecture In this section, we describe the design of a flexible architecture for a Peer-to-Peer system. We also enhance the basic protocol with several optimizations such as caching keys for efficient data lookup, data replication for data availability, using history information for efficient join and leave operations and exploiting features of other P2P DiST: A Scalable, Efficient P2P Lookup Protocol 43 Table 1.
Agents and Peer-to-Peer Computing: Third International Workshop, AP2PC 2004, New York, NY, USA, July 19, 2004, Revised and Invited Papers by Arturo Crespo, Hector Garcia-Molina (auth.), Gianluca Moro, Sonia Bergamaschi, Karl Aberer (eds.)