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{
  "blueprint" : "multi-node-hdfs-yarn",
  "default_password" : "my-super-secret-password",
  "host_groups" :[
    { 
      "name" : "master",  
      "hosts" : [          
        { 
          "fqdn" : "c6401.ambari.apache.org" 
        }
      ]
    },
    { 
      "name" : "slaves",  
      "hosts" : [
        { 
          "fqdn" : "c6402.ambari.apache.org" 
        },
        { 
          "fqdn" : "c6403.ambari.apache.org"
        }
      ]
    }
  ]
}

POST /api/v1/clusters/MyThreeNodeCluster
...
[ Request Body is above Cluster Creation Template ]
...

202 - Accepted
{
  "href" : "http://c6401.ambari.apache.org:8080/api/v1/clusters/MyClusterMyThreeNodeCluster/requests/1",
  "Requests" : {
    "id" : 1,
    "status" : "InProgress"
  }
}