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

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