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So what happens if a network partition occurs where both sides can elect a new leader?

This can't happen. You can't devide a cluster in half and still have a majority. See my other post.

Ah, ok so all nodes needs to be known beforehand

Yeah, and any changes to the set of nodes (adding or removing a node from the cluster) must be agreed upon by a majority of the existing nodes.

At most one side can elect a new leader, since there are an odd number of nodes.