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[Balazs Gibizer <1803925@xxxxxxxxxxxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1803925

Title:
  There is no interface for operators to migrate *all* the existing
  compute resource providers to be ready for nested providers

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  When nested resource provider feature was added in Rocky,
  root_provider_uuid column, which should be non-None value is created
  in the resource provider DB. For existing resource providers created
  before queens, we have an online data migration:

  https://review.openstack.org/#/c/377138/62/nova/objects/resource_provider.py@917

  But it's only done via listing/showing resource providers. We should
  have explicit migration script something like "placement-manage db
  online_data_migrations" to make sure all the resource providers are
  ready for the nested provider feature, that is all the
  root_provider_uuid column has non-None value.

  This bug tracking can be closed when the following tasks are done
   - Provide something like "placement-manage db online_data_migrations" so that in Stein we are sure all the root_provider_uuid column is non-None value.
   - Clean placement/objects/resource_provider.py removing many TODOs like "Change this to an inner join when we are sure all root_provider_id values are NOT NULL"

  NOTE: This report is created after fixing/closing
  https://bugs.launchpad.net/nova/+bug/1799892 in a temporary way
  without the explicit DB migration script.

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