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I tried to understand why redis cluster suggests at least three masters. I read http://redis.io/topics/cluster-tutorial, https://redis.io/topics/cluster-spec Redis cluster: 3 master nodes minimum?

but they just said I should use three masters without explaining why. Can anybody explain or show me a link about this theorem? And what is the drawback without using at least 3 masters? It is said it is for high availability but again, I do not why.

user389955
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  • Eh? The cluster-spec link explains this in depth. – Michael Hampton Dec 11 '20 at 22:01
  • @MichaelHampton: I went through https://redis.io/topics/cluster-spec again and did not see where it explain why 3 masters. Did you mean the section "Availability" in which there is a probability of 1-(1/(N*2-1))? But it did not say anything about how many masters a redis cluster should have. Can you show me exactly which paragraph is about the reason? Thanks – user389955 Dec 14 '20 at 06:32

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