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ambari HDFS-HA 回滚
curl -u admin:admin -H "X-Requested-By: ambari" -X GET http://zwshen86:8080/api/v1/clusters/bigdata/services/STORM
命令中的 zwshen86 为 Ambari Server 的机器名（端口默认为 8080），bigdata 为 cluster 名字，STORM 为 Service 的名字。
查看hdfs的信息
curl -u admin:admin -H "X-Requested-By: ambari" -X GET http://node01:8080/api/v1/clusters/ocdp/services/HDFS
node01,datanode,journalnode,
node02,datanode,journalnode,SECONDARY_NAMENODE
node03,datanode,journalnode
node04,namenode,
node05,namenode,
回滚操作：
sudo su -l hdfs -c ‘hdfs dfsadmin -safemode enter‘ sudo su -l hdfs -c ‘hdfs dfsadmin -saveNamespace‘
查看各主机的组件角色
curl -u admin:admin -i http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=NAMENODE curl -u admin:admin -i http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=SECONDARY_NAMENODE curl -u admin:admin -i http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=JOURNALNODE curl -u admin:admin -i http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=ZKFC
删除zkfc
curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://node01:8080/api/v1/clusters/ocdp/hosts/node05/host_components/ZKFC curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://node01:8080/api/v1/clusters/ocdp/hosts/node04/host_components/ZKFC
启用SECONDARY_NAMENODE
curl -u admin:admin -H "X-Requested-By: ambari" -X POST -d ‘{"host_components" : [{"HostRoles":{"component_name":"SECONDARY_NAMENODE"}}] }‘ http://node01:8080/api/v1/clusters/ocdp/hosts?Hosts/host_name=node02
curl -u admin:admin -H "X-Requested-By: ambari" -X PUT -d ‘{"RequestInfo":{"context":"Enable Secondary NameNode"},"Body":{"HostRoles":{"state":"INSTALLED"}}}‘ http://node01:8080/api/v1/clusters/ocdp/hosts/node02/host_components/SECONDARY_NAMENODE
curl -u admin:admin -H "X-Requested-By: ambari" -X GET "http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=SECONDARY_NAMENODE&fields=HostRoles/state"
删除journalnode
curl -u admin:admin -H "X-Requested-By: ambari" -X GET http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=JOURNALNODE curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://node01:8080/api/v1/clusters/ocdp/hosts/node01/host_components/JOURNALNODE curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://node01:8080/api/v1/clusters/ocdp/hosts/node02/host_components/JOURNALNODE curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://node01:8080/api/v1/clusters/ocdp/hosts/node03/host_components/JOURNALNODE
删除额外的namenode：
curl -u admin:admin -H "X-Requested-By: ambari" -X GET http://node01:8080/api/v1/clusters/ocdp/host_components?HostRoles/component_name=NAMENODE curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE http://node01:8080/api/v1/clusters/ocdp/hosts/node05/host_components/NAMENODE
重启服务
ambari HDFS-HA 回滚
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