hadoop-hdfs-project/hadoop-hdfs/src/test/resources/dfs.hosts.json

[
  {"hostName": "host1"},
  {"hostName": "host2", "upgradeDomain": "ud0"},
  {"hostName": "host3", "adminState": "DECOMMISSIONED"},
  {"hostName": "host4", "upgradeDomain": "ud2", "adminState": "DECOMMISSIONED"},
  {"hostName": "host5", "port": 8090}
]