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 2. Rolling Back NameNode HA

To roll back NameNode HA to the previous non-HA state use the following step-by-step manual process. Some of the steps are optional depending on your installation.

  1. Stop HBase

  2. Checkpoint the Active NameNode

  3. Stop All Services

  4. Prepare the Ambari Server Host for Rollback

  5. Restore the HBase Configuration

  6. Delete ZK Failover Controllers

  7. Modify HDFS Configurations

  8. Recreate the Secondary NameNode

  9. Re-enable the Secondary NameNode

  10. Delete All JournalNodes

  11. Delete the Additional NameNode

  12. Verify the HDFS Components

  13. Start HDFS

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