[
    {
      "id": "d1",
      "role": "leader",
      "capacity": 1.0,
      "ip": "0.0.0.0",
      "port": 3700
    },
    {
      "id": "d2",
      "role": "worker",
      "capacity": 1.0,
      "ip": "0.0.0.0",
      "port": 3701,
      "parentID": "d1",
      "parentIP": "127.0.0.1",
      "parentPort": 3700
    },
    {
      "id": "d3",
      "role": "worker",
      "capacity": 2.0,
      "ip": "0.0.0.0",
      "port": 3702,
      "parentID": "d1",
      "parentIP": "127.0.0.1",
      "parentPort": 3700
    }
  ]