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First, affinity function uniquely defines a partition for key: P(key) = partition partition.

This is a static property and cannot change in time.

The default implementation of function P is modulo division: abs(key.hashCode) % partitionsCount.

Second, affinity function defines which partitions belongs to the node: F(topology, part) = list(nodes)

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The default implementation for function F uses the rendezvous hashing algorithm https://en.wikipedia.org/wiki/Rendezvous_hashing

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