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Network churn is an inherent characteristic of a P2P overlay. While nodes continuously
enter and exit the network, some nodes are more stable than others.
For example, machines that are connected through wireless links are more likely
to disconnect from the network than those that are on wired connections. Naturally,
it is preferable to place replicas on more stable nodes. In powerline network configuration, replica
reliability is expressed through the failure probability of the node hosting it, and
reliability maximization is achieved by minimizing replica failure probability.
Hosts failure probabilities are drawn randomly and they can be updated by
tracking the history of hosts in the system.
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