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[David Li <1836439@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

1、posts two requests at same time to delete same flavor's two extra_specs keys
2、the two requests all get success from nova
3、finds only one extra_specs keys be deleted
that seems when handles the first delete request, the delete function of /nova/api/openstack/compute/flavors_extraspecs.py gets target flavor's all extra_specs info, and then saves the all extra_specs info again except the deleted one. see [1][2][3]:
[1] https://github.com/openstack/nova/blob/master/nova/objects/flavor.py#L531
[2] https://github.com/openstack/nova/blob/master/nova/objects/flavor.py#L480
[3] https://github.com/openstack/nova/blob/master/nova/objects/flavor.py#L483

** Affects: nova
     Importance: Undecided
         Status: New

** Summary changed:

- one extra spec  key still exist when delete one flavor two extra_specs  keys at same time 
+ one extra_specs  key still exist when delete one flavor's two extra_specs  keys at same time

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https://bugs.launchpad.net/bugs/1836439

Title:
  one extra_specs  key still exist when delete one flavor's two
  extra_specs  keys at same time

Status in OpenStack Compute (nova):
  New

Bug description:
  1、posts two requests at same time to delete same flavor's two extra_specs keys
  2、the two requests all get success from nova
  3、finds only one extra_specs keys be deleted
  that seems when handles the first delete request, the delete function of /nova/api/openstack/compute/flavors_extraspecs.py gets target flavor's all extra_specs info, and then saves the all extra_specs info again except the deleted one. see [1][2][3]:
  [1] https://github.com/openstack/nova/blob/master/nova/objects/flavor.py#L531
  [2] https://github.com/openstack/nova/blob/master/nova/objects/flavor.py#L480
  [3] https://github.com/openstack/nova/blob/master/nova/objects/flavor.py#L483

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