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A few proprietary implementations exist as well, but currently none are available as SDKs; rather, they are embedded in commercially available products.Each DHT scheme generally is pitched as being an entity unto itself, different from all other schemes.First, take the key and hash it to generate a key of exactly k bits.Treat this number as a node ID, and determine which node is its successor by starting at any point in the ring and working clockwise until a node is found whose ID is closest to but still greater than the key.
A simple way to determine which node is appropriate for a particular key (the one Chord uses) is the same as the method for determining the successor of a particular node ID.
The node you find is the node responsible for storage and lookup for that particular key (Listing 2).
Using a hash to generate the key is beneficial because hashes generally are distributed evenly, and different keys are distributed evenly across all of the nodes in the network.
Arrange the nodes in a ring so the IDs are in increasing order clockwise around the ring.
For each node, the next node is the one that is the smallest distance clockwise away.