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  • Good explanation - just wanted to add that that Read Repair can update the nodes, in the background, so that the next read will be up-to-date. Commented Oct 23, 2011 at 14:04
  • @DNA just note that read repair is not done in all cases. It's controlled by read_repair_chance which is set to 0.1 by default. So you have 10% chance, that the next read will be up-to-date. Commented Oct 21, 2017 at 16:33
  • good answer . if R+W=2N, It's the same as one single node, doesn't add any fault tolerance. Commented Apr 18, 2020 at 6:32