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Discouraging response to nova-manage db online_data_migrations
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Description

2022-08-30 15:46:03.425 1682001 WARNING nova.objects.instance_mapping [req-c49f54e2-4884-448f-a746-dd94c6644d8d - - - - -] Some instance mappings were not migratable. This may be transient due to in-flight instance builds, or could be due to stale data that will be cleaned up after running "nova-manage db archive_deleted_rows --purge".

Event Timeline

I re-ran this command many times and it turns out to have been chipping away at the backlog on each run. So the set of things needing to be migrated is now much shorter, but still non-0.

papered over with 'update instance_mappings set user_id='unknown' where user_id is null;'