1.1.11. Delete the Additional NameNode

To check to see if you need to delete your Additional NameNode, on the Ambari Server host:

curl -u ${AMBARI_USER}:${AMBARI_PW} -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, on the Ambari Server host:

curl -u ${AMBARI_USER}:${AMBARI_PW} -i -X DELETE ${AMBARI_PROTO}://localhost:${AMBARI_PORT}/api/v1/clusters/${CLUSTER_NAME}/hosts/${ADDITIONAL_NAMENODE_HOSTNAME}/host_components/NAMENODE

Verify that the Additional NameNode has been deleted:

curl -u ${AMBARI_USER}:${AMBARI_PW} -i -X GET ${AMBARI_PROTO}://localhost:${AMBARI_PORT}/api/v1/clusters/${CLUSTER_NAME}/host_components?HostRoles/component_name=NAMENODE

This should return an items array that shows only one NameNode.