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 1.2. How to Roll Back NameNode HA

To roll back NameNode HA to the previous non-HA state use the following step-by-step manual process, depending on your installation.

  1. Stop HBase

  2. Checkpoint the Active NameNode

  3. Stop All Services

  4. Prepare the Ambari Host for Rollback

  5. Restore the HBase Configuration

  6. Delete ZooKeeper Failover Controllers

  7. Modify HDFS Configurations

  8. Recreate the standby NameNode

  9. Re-enable the standby NameNode

  10. Delete All JournalNodes

  11. Delete the Additional NameNode

  12. Verify the HDFS Components

  13. Start HDFS

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