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Networking configuration have been an active area of research. masterslave
replication model has been adopted by several systems. For example, Sacha
and Dowling [7] utilize a gradient technique for designing a master-slave replication
for peer-to-peer networks. Replica placement problem has also received
considerable research attention in recent years. In the Gnutella P2P system [2],
only the nodes which request and retrieve a data-item hold a copy of that object.
Freenet [8], however, allows replicas to be created on nodes other than
the ones that requested the data-item. Cohen and Shenker [9] propose the path
replication scheme, wherein replicas are placed along the path traversed by a
data request. They also discuss random placement scheme where the replicas
are placed on randomly chosen nodes in the overlay network. Some researchers
have also addressed the question of how many replicas of a given data-item need
to be maintained in the overlay. Proportional replication, wherein the number
of replicas of a data-item increase with its usage has been discussed by Lv et al.
[10]. They also contrast this scheme with a uniform replication scheme where the
same number of replicas is created for all data-items. Benayoune and Lancieri
[11] survey several replication techniques including the idea of replicating references
of data-items instead of the data-items themselves.
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