code: def add_node(self, node):
          
          self.nodes.append(node)
          for x in xrange(self.replicas):
              ring_key = self.hash_method(b("%s:%d" % (node, x)))
              self.ring[ring_key] = node
              self.sorted_keys.append(ring_key)
  
          self.sorted_keys.sort()
docs: Adds a `node` to the hash ring (including a number of replicas).