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Managing High Availability

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Managing high availability

Rolling back NameNode high availablity

To disable (roll back) NameNode high availability, perform these tasks (depending on your installation):

Stop HBase
Checkpoint the active NameNode
Stop all services
Prepare the Ambari server host for NameNode rollback
To prepare for the NameNode rollback task:
Restore the HBase configuration
Delete ZooKeeper failover controllers
Modify HDFS configurations
You may need to modify your hdfs-site configuration and/or your core-site configuration.
Re-create the standby NameNode
You may need to recreate your standby NameNode.
Re-enable the standby NameNode
To re-enable the standby NameNode:
Delete all JournalNodes
You may need to delete any JournalNodes.
Delete the additional NameNode
You may need to delete your additional NameNode.
Verify the HDFS components
Start HDFS

Parent topic: Configuring NameNode high availability

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