Re-create the Secondary NameNode
You may need to recreate your secondary NameNode.
Prerequisites
Check whether you need to recreate the secondary 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=SECONDARY_NAMENODE
If this returns an empty items array, you must
recreate your secondary NameNode. Otherwise you can proceed to
re-enable your secondary NameNode.
To recreate your secondary NameNode:
Steps
On the Ambari Server host, run the following command:
curl -u <AMBARI_USER>:<AMBARI_PW> -H "X-Requested-By: ambari" -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, run the following command:
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=SECONDARY_NAMENODEThis should return a non-empty
itemsarray containing the secondary NameNode.
More Information