6.2.1.8. Recreate the Secondary NameNode

To check to see if you need to recreate the Secondary 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=SECONDARY_NAMENODE

If this returns an empty items array, you must recreate your Secondary NameNode. Otherwise you can go on to Re-enable Secondary NameNode.

Recreate your Secondary NameNode. On the Ambari Server host:

curl -u ${AMBARI_USER}:${AMBARI_PW} -i -X POST -d '{"host_components" : [{"HostRoles":{"component_name":"SECONDARY_NAMENODE"}}] }' ${AMBARI_PROTO}://localhost:${AMBARI_PORT}/api/v1/clusters/${CLUSTER_NAME}/hosts?Hosts/host_name=${SECONDARY_NAMENODE_HOSTNAME}

Verify that the Secondary NameNode now exists. 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=SECONDARY_NAMENODE

This should return a non-empty items array containing the Secondary NameNode.