1.1.6. Delete ZK Failover Controllers

To check if you need to delete ZK Failover Controllers, 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=ZKFC

If this returns an empty items array, you can go on to Modify HDFS Configuration. Otherwise you must use the DELETE commands below.

To delete all ZK Failover Controllers, on the Ambari Server host:

curl -u ${AMBARI_USER}:${AMBARI_PW} -H "X-Requested-By: ambari" -i -X DELETE ${AMBARI_PROTO}://localhost:${AMBARI_PORT}/api/v1/clusters/${CLUSTER_NAME}/hosts/${NAMENODE_HOSTNAME}/host_components/ZKFC
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/ZKFC

Verify that the ZK Failover Controllers have been deleted. On the Ambari Server host:

curl -u ${AMBARI_USER}:${AMBARI_PW} -H "X-Requested-By: ambari" -i ${AMBARI_PROTO}://localhost:${AMBARI_PORT}/api/v1/clusters/${CLUSTER_NAME}/host_components?HostRoles/component_name=ZKFC

This command should return an empty items array.