Leader next to its majority

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Goals

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99 of 100 requests finish faster than this.What the servers and services cost each month.

A database keeps 5 replicas on 3 continents; a write commits when the leader and 2 more replicas have it. The writes come from London and Frankfurt. Pick the leader and the fifth replica site: every commit under 30 ms, at most 16,000 USD/mo.

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Lasers in orbit, New York to London · 7,151 km · 24 ms one way