I have Cloudera 5.16.1 with HA enabled for HDFS.
I want to upgrade OS on both NameNode servers (Active & Standby) to CentOS 7 and keep all settings.
What's the correct way to do it ?
I tried the following:
1. Backed up jn & nn folders in both NameNode servers along with other few folders
2. Stopped all services in the cluster
3. Deleted standby NameNode server from cluster and from cloudera manager
4. Reinstalled the server
5. Added server back to cluster
6. Restored files
7. Started services back
But, it failed to re-enable the HA again.
Please assist / advise
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