Cloning cluster data from clusters managed by the same OpsCenter instance

Clone cluster data from one DSE cluster to another using the Restore Backup feature in OpsCenter. This workflow requires the source and target clusters to both be managed by the same OpsCenter instance.

1. Click the source cluster name > Services.
2. Click the Details link for the Backup Service.
3. In the Activity tab, click Restore Backup.

   The Restore from Backup dialog appears.

   
4. In the Backups tab, select the backup that contains the data you want to clone and click Next.
   Note: On Server backups are not eligible for cloning.
5. Select the tables included in the backup you want to restore. Click the keyspace name to include all the tables in the keyspace. Click All Keyspaces to restore all the keyspaces.

   

   To select only specific tables, expand the keyspace name and select the tables.

   Note: Consider the following caveats when creating and restoring backups:

   • Restoring a snapshot that contains only the system keyspace is not allowed. There must be both system and non-system keyspaces, or only non-system keyspaces in the snapshot you want to restore.
   • Restoring a snapshot that does not contain a table definition is not allowed.
   • Restoring from a backup while Kerberos is enabled is not currently supported by OpsCenter.
   • Restoring a snapshot to a location with insufficient disk space fails. The Restore Report indicates which nodes do not have sufficient space and how much space is necessary for a successful restore. For more information and tips for preventative measures, see Monitoring sufficient disk space for restoring backups.
6. Under Location, select the target cluster for the restored data. Select a different cluster than the one that was backed up to clone the data to the cluster.
   The Location list is only available when there are multiple clusters and both clusters are managed by the same instance of OpsCenter.
7. Optional: To remove the existing keyspace data before the data is restored, select Truncate/delete existing data before restore. This completely removes any updated data in the cluster for the keyspaces you are restoring.
8. To prevent overloading the network, set a maximum transfer rate for the restore. Select Throttle stream throughput at ____ MB and set the maximum MB per second.
9. Change the staging directory if necessary by setting the backup_staging_directory configuration option in address.yaml.
10. Click Restore Backup.
    The Confirm Restore dialog appears.

    

    Warning: If a value was not set for throttling stream output, a warning message indicates the consequences of unthrottled restores. Take one of the following actions:

    • Click Cancel and set the throttle value in the Restore from Backup dialog.
    • Set the stream_throughput_outbound_megabits_per_sec and inter_dc_stream_throughput_outbound_megabits_per_sec values in cassandra.yaml.
    • Proceed anyway at the risk of creating network bottlenecks.

    Tip: If you are using LCM to manage DSE cluster configuration, update Cluster Communication settings in cassandra.yaml in the config profile for the cluster and run a configuration job. Stream throughput (not inter-dc) is already set to 200 in LCM defaults.

    

11. Click Start Restore to confirm the restore.
    If the pre-restore checks detected schema differences that could not automatically be validated, the Restore Schema Validation dialog appears. Possible issues are listed and a comparison of the backup and current schema are presented side-by-side.

    

12. Review the information to determine what adjustments if any need to be made to the current schema:
    • To rectify the schema issues and try the restore again afterward, click Cancel.
    • To proceed despite the schema mismatch, click Continue Restore.
      Warning: Attempting to restore a backup with an incompatible schema might result in corrupt or inaccessible data. Before forcing the restore, back up your current data.