search(:node, "roles:hadoop-masternamenode") do |nmas|
  # search(:node, "roles:hadoop-masternamenode#{env_filter}") do |nmas|
  if !nmas[:fqdn].nil? && !nmas[:fqdn].empty?
    Chef::Log.info("HADOOP : MASTER [#{nmas[:fqdn]}") if debug
    master_name_nodes << nmas[:fqdn]