Delete the Additional NameNode
You may need to delete your Additional NameNode.
Prerequisites
Check to see if you need to delete your Additional NameNode, on the Ambari Server host:
curl -u <AMBARI_USER>:<AMBARI_PW> -H "X-Requested-By:
ambari" -i -X GET
<AMBARI_PROTO>://localhost:<AMBARI_PORT>/api/v1/clusters/<CLUSTER_NAME>/host_components?HostRoles/component_name=NAMENODE
If the items array contains two NameNodes, the Additional
NameNode must be deleted.
To delete the Additional NameNode that was set up for HA:
Steps
On the Ambari Server host, run the following command:
curl -u <AMBARI_USER>:<AMBARI_PW> -H "X-Requested-By: ambari" -i -X DELETE <AMBARI_PROTO>://localhost:<AMBARI_PORT>/api/v1/clusters/<CLUSTER_NAME>/hosts/<ADDITIONAL_NAMENODE_HOSTNAME>/host_components/NAMENODEVerify that the Additional NameNode has been deleted:
curl -u <AMBARI_USER>:<AMBARI_PW> -H "X-Requested-By: ambari" -i -X GET <AMBARI_PROTO>://localhost:<AMBARI_PORT>/api/v1/clusters/<CLUSTER_NAME>/host_components?HostRoles/component_name=NAMENODEThis should return an
itemsarray that shows only one NameNode.