Object deletion from DB without driver interaction

Object deletion from DB without driver interaction

https://blueprints.launchpad.net/cinder/+spec/cinder-delete-from-db

Problem description

It’s impossible to delete a volume, a backup or a snapshot when the service is not available. There’s no way to bypass driver interaction.

Use Cases

Sometimes, OpenStack admins are pulling the plugs off some storage backends to use a new one. They realize later that they need to cleanup the various objects.

Proposed change

With cinder-manage, we will have a –db-only switch under the volume delete command. The snapshots are deleted in cascade. We will also implement backup subcommand that acts like the volume subcommand.

Alternatives

The only known workaround is to manually update multiple tables and set the status to ‘deleted’ to various objects.

Data model impact

None

REST API impact

None

Security impact

None

Active/Active HA impact

None

Notifications impact

None

Other end user impact

These commands will be available to operators:

cinder-manage volume delete [--db-only] <volume-id>
cinder-manage backup delete [--db-only] <backup-id>

Performance Impact

None

Other deployer impact

None

Developer impact

None

Implementation

Assignee(s)

Primary assignee: David Vallee Delisle <dvd@redhat.com>

Work Items

The following changes will be done under cinder-manage command: * Add a –db-only switch to the volume delete command. * Add a backup delete subcommand with –db-only support. * The snapshots are deleted in cascade when a volume is deleted.

The following changes will be done in the rpcapis: * Add a db_only argument in the delete function

The following changes will be done in the manages: * Add a db_only argument in the delete function

Dependencies

None

Testing

Create tests to validate the delete volume and the delete backup are really deleting.

Documentation Impact

Man page for cinder-manage and any associated documentation will be updated.

References

None

Creative Commons Attribution 3.0 License

Except where otherwise noted, this document is licensed under Creative Commons Attribution 3.0 License. See all OpenStack Legal Documents.

cinder-specs 0.0.1.dev513