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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Tags added: cells ocata-backport-potential quotas

** Changed in: nova
   Importance: Undecided => High

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Changed in: nova/ocata
       Status: New => Confirmed

** Changed in: nova/ocata
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1670627

Title:
  quota is always in-use after delete the ERROR instances

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) ocata series:
  Confirmed

Bug description:
  1. stop nova-compute 
  2. boot an instance 
  3. the instance is in ERROR
  4. delete the instance
  5. repeat 1-4 for several times(actually, I create the instance by heat, heat will retry to create the instance 5 times by default and will delete the error instance before every retrying)
  6. I can't boot instance after nova-compute back, the reason is "Quota exceeded for instances: Requested 1, but already used 10 of 10 instances"
  7. but in fact, there is no instance return by cmd nova-list
  8. I find that the quota is still in-use, see table 'quota_usages':

  mysql> select *from quota_usages;
  +---------------------+---------------------+------------+----+----------------------------------+-----------+--------+----------+---------------+---------+----------------------------------+
  | created_at          | updated_at          | deleted_at | id | project_id                       | resource  | in_use | reserved | until_refresh | deleted | user_id                          |
  +---------------------+---------------------+------------+----+----------------------------------+-----------+--------+----------+---------------+---------+----------------------------------+
  | 2017-03-07 06:26:08 | 2017-03-07 08:48:09 | NULL       |  1 | 2b623ba1dddc476cbb7728a944d539c5 | instances |     10 |        0 |          NULL |       0 | 8d57d7a267b54992b382a6607ecd700a |
  | 2017-03-07 06:26:08 | 2017-03-07 08:48:09 | NULL       |  2 | 2b623ba1dddc476cbb7728a944d539c5 | ram       |   5120 |        0 |          NULL |       0 | 8d57d7a267b54992b382a6607ecd700a |
  | 2017-03-07 06:26:08 | 2017-03-07 08:48:09 | NULL       |  3 | 2b623ba1dddc476cbb7728a944d539c5 | cores     |     10 |        0 |          NULL |       0 | 8d57d7a267b54992b382a6607ecd700a |
  | 2017-03-07 09:17:37 | 2017-03-07 09:35:14 | NULL       |  4 | 12bdc74d666d4f7687c0172a003f190d | instances |     13 |        0 |          NULL |       0 | 98887477e65e43f383f8a9ec732a3eae |
  | 2017-03-07 09:17:37 | 2017-03-07 09:35:14 | NULL       |  5 | 12bdc74d666d4f7687c0172a003f190d | ram       |   6656 |        0 |          NULL |       0 | 98887477e65e43f383f8a9ec732a3eae |
  | 2017-03-07 09:17:37 | 2017-03-07 09:35:14 | NULL       |  6 | 12bdc74d666d4f7687c0172a003f190d | cores     |     13 |        0 |          NULL |       0 | 98887477e65e43f383f8a9ec732a3eae |
  +---------------------+---------------------+------------+----+----------------------------------+-----------+--------+----------+---------------+---------+----------------------------------+

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