question Re: secondary name node wizard option in Archives of Support Questions (Read Only)

secondary name node wizard option

dpnctl — Sun, 18 Aug 2019 11:43:12 GMT

I am unable to see ha configuration wizard in hdfs service actions. this is a running cluster with a single name node, i mean initially i was not able to add a secondary name node

can someone pls assist here

Re: secondary name node wizard option

jsensharma — Mon, 19 Dec 2016 22:50:42 GMT

Mahen Jay

You need at least two NameNodes in order to achieve the NameNode HA. In the screenshot i see that you have only one NameNode.

As you mentioned that you were not able to add the Secondary Name Node earlier. Can you please share what issue you were facing while adding Secondary NameNode earlier?

Re: secondary name node wizard option

smohanty — Mon, 19 Dec 2016 23:01:01 GMT

Likely, HA wizard is not showing because SecondaryNameNode is missing. How did it get deleted? Was the cluster deployed using blueprint or UI?

Re: secondary name node wizard option

dpnctl — Mon, 19 Dec 2016 23:11:29 GMT

I had only 3 machines with me, so I configured 1 as name node, and later added 2 more data nodes. Now I am trying to configure a new node as secondary name node. Is it not possible in a running configuration that I add a node and configure it to be a secondary name node?

Re: secondary name node wizard option

dpnctl — Mon, 19 Dec 2016 23:11:53 GMT

I deployed it manually, not a blue print. I didnt feel the need for a secondary namenode service to run on the same node, so deleted the option using "CURL" commands

Re: secondary name node wizard option

dpnctl — Mon, 19 Dec 2016 23:58:19 GMT

any quick help to reconfigure?

Re: secondary name node wizard option

smohanty — Tue, 20 Dec 2016 10:06:11 GMT

UI seems to use existence of Secondary NameNode to determine if HA is enabled or not. A quick option would be to add SNN manually using curl again.

curl -u admin:admin -H "X-Requested-By: ambari" -X POST http://localhost:8080/api/v1/clusters/c1/services/HDFS/components/SECONDARY_NAMENODE

curl -u admin:admin -H "X-Requested-By: ambari" -X POST http://localhost:8080/api/v1/clusters/c1/hosts/c6401.ambari.apache.org/host_components/SECONDARY_NAMENODE

Install it - curl -u admin:admin -H "X-Requested-By: ambari" -X PUT -d'{"RequestInfo":{"context":"Install SNN","operation_level":{"level":"HOST_COMPONENT","cluster_name":"c1","host_name":"c6401.ambari.apache.org","service_name":"HDFS"}},"Body":{"HostRoles":{"state":"INSTALLED"}}}' http://c6401.ambari.apache.org:8080/api/v1/clusters/c1/hosts/c6401.ambari.apache.org/host_components/SECONDARY_NAMENODE?HostRoles/state=INIT

You should be able to see the option to enable NN HA.

Re: secondary name node wizard option

dpnctl — Tue, 20 Dec 2016 14:48:20 GMT

Thank you now the option of enabling HA is seen in 'service options'

It could have been simpler if this kind of curl options are provided in GUI with a pasword proected and role based access control. I do understand the sensitivity behind this.

thanks again.