http://en.wikipedia.org/wiki/Eventual_consistency
Eventual consistency is a consistency model used in distributed computing that informally guarantees that, if no new updates are made to a given data item, eventually all accesses to that item will return the last updated value.
In order to ensure replica convergence, a system must reconcile differences between multiple copies of distributed data. This process, often known as anti-entropy, requires exchanging versions of data between servers.
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