Ambari User's Guide
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Re-enable the Standby NameNode

To re-enable the standby NameNode, on the Ambari Server host:

curl -u <AMBARI_USER>:<AMBARI_PW> -H "X-Requested-By: ambari" -i -X PUT -d'{"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.