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[Ed Leafe <ed@xxxxxxxxx>]

Public bug reported:

When resizing an instance, the migration task calls "replace_allocation_with_migration()', which checks to verify that the instance has allocations against the source compute node [0]. It then replaces the instance's allocation with the migration, using it's UUID as the consumer instead of the instance's. However, if the first attempt at migrating fails and the resize is rescheduled, when "replace_allocation_with_migration()" is called again, the allocations now have the migration UUID as the consumer, and so the check that the instance has allocations on the source compute node will fail, and the migration is put in an ERROR state.
 
[0] https://github.com/openstack/nova/blob/f95f165b49fbc0efe29450b0e858a3ccadecedea/nova/conductor/tasks/migrate.py#L47-L48

** Affects: nova
     Importance: High
     Assignee: Ed Leafe (ed-leafe)
         Status: Confirmed


** Tags: migration placement queens-rc-potential resize

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https://bugs.launchpad.net/bugs/1741125

Title:
  Instance resize always fails when rescheduling

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  When resizing an instance, the migration task calls "replace_allocation_with_migration()', which checks to verify that the instance has allocations against the source compute node [0]. It then replaces the instance's allocation with the migration, using it's UUID as the consumer instead of the instance's. However, if the first attempt at migrating fails and the resize is rescheduled, when "replace_allocation_with_migration()" is called again, the allocations now have the migration UUID as the consumer, and so the check that the instance has allocations on the source compute node will fail, and the migration is put in an ERROR state.
   
  [0] https://github.com/openstack/nova/blob/f95f165b49fbc0efe29450b0e858a3ccadecedea/nova/conductor/tasks/migrate.py#L47-L48

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