To re-enable the standby NameNode, on the Ambari Server host:
curl -u <AMBARI_USER>:<AMBARI_PW> -H "X-Requested-By:
ambari" -i -X '{"RequestInfo":{"context":"Enable
Secondary
NameNode"},"Body":{"HostRoles":{"state":"INSTALLED"}}}'<AMBARI_PROTO>://localhost:<AMBARI_PORT>/api/v1/clusters/<CLUSTER_NAME>/hosts/<SECONDARY_NAMENODE_HOSTNAME}/host_components/SECONDARY_NAMENODE
If this returns 200, go to Delete All JournalNodes.
If this returns 202, wait a few minutes and run the following command on the Ambari Server host:
curl -u <AMBARI_USER>:${AMBARI_PW -H "X-Requested-By: ambari" -i -X "<AMBARI_PROTO>://localhost:<AMBARI_PORT>/api/v1/clusters/<CLUSTER_NAME>/host_components?HostRoles/component_name=SECONDARY_NAMENODE&fields=HostRoles/state"When
"state" : "INSTALLED"is in the response, go on to the next step.
