Adding another Namenode to HDP HA Cluster

Question

I have HDP3 High Availability enabled on the cluster. I have tested it and everything seems to be fine.

Current Setup is nn1 (Active), nn2 (Passive)

Now, I am trying to add another NameNode, which makes this setup from NN1, NN2 to

NN1, NN2 (Passive), NN3 (Passive).

If we look at the steps that are needed from Apache documentation as :

• Apache documentation

or From Cloudera/Hortonworks:

• Configuring the namenode HA cluster
• Deploying namenode HA cluster

and particularly followed, Step 7 for new namenode

I change configurations as

dfs.ha.namenodes.mycluster = nn1,nn2,nn3

dfs.namenode.http-address.mycluster.nn3 = vmhdpmaster003:50070

dfs.namenode.https-address.mycluster.nn3 = vmhdpmaster003:50470

dfs.namenode.rpc-address.mycluster.nn3 = vmhdpmaster003:8020

dfs.namenode.shared.edits.dir = qjournal://vmhdpmaster003:8485;vmhdpmaster001:8485;vmhdpmaster002:8485/mycluster

After applying the changes., I don't see nn3 added as another namenode.

So then I tried,

su -l hdfs -c "hdfs namenode -bootstrapStandby -force

Now, I am getting an error like nn/vmhdpmaster003@REALM.com is able to get ticket, because there is no keytab file at /etc/security/keytabs. My cluster is configured with AD integration.

Please help me how to create this missing keytab. Why ambari does not create a keytab itself? Is there a way to generate keytabs for service accounts via curl for ambari?