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{
  "blueprint" : "single-node-hdfs-yarn",
  "default-_password" : "my-super-secret-password",
  "host_groups" :[
    { 
      "name" : "host_group_1",  
      "hosts" : [          
        { 
          "fqdn" : "c6401.ambari.apache.org"
        }
      ]
    }
  ]
}