6f4faa9637
Note that resource-classes was already moved but the redirects file wasn't updated, that's fixed here. There are some partial blueprints that were marked completed in mitaka and are still being worked in newton, like the config option work. I've moved those to implemented here also. Change-Id: I16f279b4794127cb7abc40ffc22cc237702d14ed
2.6 KiB
No more soft delete
https://blueprints.launchpad.net/nova/+spec/no-more-soft-delete
There was widespread agreement at the YVR summit not to soft-delete any more things. To codify this, we should remove the SoftDeleteMixin from NovaBase.
Problem description
Soft deletion of rows imposes a management overhead to later delete or archive those rows. It has also proved less necessary than initially imagined. We would prefer additional soft-deletes were not added and so it does not make sense to automatically inherit the SoftDeleteMixin when inheriting from NovaBase.
Use Cases
As an operator, adding new soft deleted things means I need to extend my manual cleanup to cover those things. If I don't, those tables will become very slow to query.
As a developer, I don't want to tempt operators to read soft-deleted rows directly. That risks turning the DB schema into an unofficial API.
As a developer/DBA, providing deleted and deleted_at columns on tables which are not soft-deleted is confusing. One might also say it's confusing to soft-delete from tables where deleted rows are never read.
Proposed change
This spec proposes removing the SoftDeleteMixin from NovaBase and re-adding it to all tables which currently inherit from NovaBase. The removal of SoftDeleteMixin from those tables which don't need it will be left for future work.
Alternatives
We could not do this. This means we need an extra two columns on new tables and it makes it slightly easier to start soft-deleting new tables.
Data model impact
None.
REST API impact
None.
Security impact
None.
Notifications impact
None.
Other end user impact
None.
Performance Impact
None.
Other deployer impact
None.
Developer impact
None.
Implementation
Assignee(s)
- Primary assignee:
-
alexisl
- Other contributors:
-
None
Work Items
- Remove SoftDeleteMixin from NovaBase.
- Add it to all models which inherited from NovaBase.
Dependencies
None.
Testing
None.
Documentation Impact
None.
References
None.
History
| Release Name | Description |
|---|---|
| Liberty | Introduced |
| Mitaka | Simplified and re-proposed |