Dht nodes updating

Chord is based on consistent hashing, which assigns hash keys to nodes in a way that doesn't need to change much as nodes join and leave the system.

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When a node n does not know the successor of a key k, it sends a ``find successor'' request to a intermediate node whose ID is closer to k.

Node n finds the intermediate node by searching its finger table for the closest finger f preceding k, and sends the find successor request to f.

Lookups take a number of hops proportional to the log of the number of nodes in the system.

For each hop, the node doing the lookup sends a find successor message, and waits for the result; the result tells it where to send the next find successor message.

Node f looks in its finger table for the closest entry preceding k, and sends that back to n.

As a result n learns about nodes closer and closer to the target ID. Suppose node 3 wants to find the successor of identifier 1.

No other changes in the assignment of keys to nodes need occur.

In the example above, if a node were to join with identifier 6, it would capture the key with identifier 6 from the node with identifier 7.

The ith entry in the table at node n contains the identity of the first node, s, that succeeds n by at least 2^(i-1) on the identifier circle, i.e., s = successor(n 2^(i - 1)), where 1 ≤ i ≤ 160 (and all arithmetic is modulo 2^160).

The node s is called the ith finger of node n, and denoted by n.finger[i]

In this section, we provide a short summary of the Chord protocol so that the reader has sufficient background to follow the rest of the paper.

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