Why does consistent hashing give each server many virtual nodes on the ring instead of one position?

Options

• ✗ So each key is stored on several servers
• ✓ To even out the load, and so a leaving server's keys spread over many servers instead of one neighbour Correct
• ✗ To make lookups take constant time
• ✗ To avoid hashing the keys at all

Why

With one point each, servers get very uneven arcs of the ring, and a failed server dumps its whole arc on its single neighbour. Many points per server average out the arcs; giving bigger machines more points also weights them.

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