class Redis::Cluster

def _scan(command, &block)
  input_cursor = Integer(command[1])
  client_index = input_cursor % 256
  raw_cursor = input_cursor >> 8
  clients = @node.scale_reading_clients
  client = clients[client_index]
  return ['0', []] unless client
  command[1] = raw_cursor.to_s
  result_cursor, result_keys = client.call(command, &block)
  result_cursor = Integer(result_cursor)
  if result_cursor == 0
    client_index += 1
  end
  [((result_cursor << 8) + client_index).to_s, result_keys]
end