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Clustering is the ability to have multiple machines for a single "server."
The game world will be essentially split so one machine runs one portion of the game and another runs another portion.
For example you could split it that a machine runs 4 worlds and another machine runs the rest. Then of course a separate login server etc.
Very complex code as you have to keep track of when people jump between machines and then any chat has to be sent between those machines etc.
Essentially it provides a scaling mechanism so the more money you throw at servers the mroe people you can support.
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