Public bug reported:

Description
===========
instance_group_members record also exist in database after delete vm

Steps to reproduce
==================
1:create affinity instance_group
2:create vm
3:delete vm


Actual result
=============

Database changed
MariaDB [nova_api]> select * from instance_group_member where group_id='3';
+---------------------+------------+-----+--------------------------------------+----------+
| created_at          | updated_at | id  | instance_uuid                        
| group_id |
+---------------------+------------+-----+--------------------------------------+----------+
| 2018-02-12 09:14:42 | NULL       | 106 | 3b9aa471-612f-4967-a405-574241e84aa0 
|        3 |
| 2018-02-12 09:15:14 | NULL       | 107 | e04244d9-2832-482a-9793-b5cc5b018de2 
|        3 |
| 2018-02-22 03:05:40 | NULL       | 108 | ff7a2194-9f38-4a7e-a67f-f0c53e409e9b 
|        3 |
| 2018-02-22 04:07:43 | NULL       | 109 | 50000a55-8d0f-4592-ae0f-e9223c3f6a32 
|        3 |
| 2018-02-22 08:36:44 | NULL       | 110 | 4ef31c5c-d96f-4e24-ba86-75c5576ae4ed 
|        3 |
| 2018-02-22 09:36:39 | NULL       | 111 | 0378c1bb-2d79-4b33-8115-77a75996af38 
|        3 |
| 2018-02-23 00:40:05 | NULL       | 112 | 08dac72d-8f04-4f7d-8b9a-60b0cf000951 
|        3 |
+---------------------+------------+-----+--------------------------------------+----------+
7 rows in set (0.00 sec)

MariaDB [nova_api]> use nova;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [nova]> select * from instances where 
uuid='3b9aa471-612f-4967-a405-574241e84aa0';
+---------------------+---------------------+---------------------+-----+-------------+----------------------------------+----------------------------------+--------------------------------------+-----------+------------+--------------+----------+----------+-------------+----------+-----------+-------+------------+-------------+-----------+----------------+---------------------+---------------------+--------------+---------------------+-------------------+--------+---------+-------------+------------------+---------+--------------------------------------+--------------+------------------+--------------+--------------+--------------+------------+--------------------------+---------------------+----------+------------------+--------------------+-------------------+---------+--------------+-----------+-------------+---------+-----------+---------+--------------------+
| created_at          | updated_at          | deleted_at          | id  | 
internal_id | user_id                          | project_id                     
  | image_ref                            | kernel_id | ramdisk_id | 
launch_index | key_name | key_data | power_state | vm_state | memory_mb | vcpus 
| hostname   | host        | user_data | reservation_id | launched_at         | 
terminated_at       | display_name | display_description | availability_zone | 
locked | os_type | launched_on | instance_type_id | vm_mode | uuid              
                   | architecture | root_device_name | access_ip_v4 | 
access_ip_v6 | config_drive | task_state | default_ephemeral_device | 
default_swap_device | progress | auto_disk_config | shutdown_terminate | 
disable_terminate | root_gb | ephemeral_gb | cell_name | node        | deleted 
| locked_by | cleaned | ephemeral_key_uuid |
+---------------------+---------------------+---------------------+-----+-------------+----------------------------------+----------------------------------+--------------------------------------+-----------+------------+--------------+----------+----------+-------------+----------+-----------+-------+------------+-------------+-----------+----------------+---------------------+---------------------+--------------+---------------------+-------------------+--------+---------+-------------+------------------+---------+--------------------------------------+--------------+------------------+--------------+--------------+--------------+------------+--------------------------+---------------------+----------+------------------+--------------------+-------------------+---------+--------------+-----------+-------------+---------+-----------+---------+--------------------+
| 2018-02-12 09:14:42 | 2018-02-13 00:58:48 | 2018-02-13 00:58:48 | 255 |       
 NULL | 86019a90ad0b44609cca8b0eb9eee79b | 01f2572fd19743558be05561e09c3850 | 
22164f51-c353-4f8a-a073-cbb2930bf25f |           |            |            0 | 
NULL     | NULL     |           0 | deleted  |      2048 |     1 | test-tx001 | 
nail-5300-2 | NULL      | r-j42bg7io     | 2018-02-12 09:14:56 | 2018-02-13 
00:58:48 | test_tx001   | NULL                | test1             |      0 | 
NULL    | nail-5300-2 |               14 | NULL    | 
3b9aa471-612f-4967-a405-574241e84aa0 | NULL         | /dev/vda         | NULL   
      | NULL         |              | NULL       | NULL                     | 
NULL                |        0 |                0 |                  0 |        
         0 |      10 |            0 | NULL      | nail-5300-2 |     255 | NULL  
    |       1 | NULL               |
+---------------------+---------------------+---------------------+-----+-------------+----------------------------------+----------------------------------+--------------------------------------+-----------+------------+--------------+----------+----------+-------------+----------+-----------+-------+------------+-------------+-----------+----------------+---------------------+---------------------+--------------+---------------------+-------------------+--------+---------+-------------+------------------+---------+--------------------------------------+--------------+------------------+--------------+--------------+--------------+------------+--------------------------+---------------------+----------+------------------+--------------------+-------------------+---------+--------------+-----------+-------------+---------+-----------+---------+--------------------+
1 row in set (0.00 sec)

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1751186

Title:
  instance_group_members also exist after delete vm

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  instance_group_members record also exist in database after delete vm

  Steps to reproduce
  ==================
  1:create affinity instance_group
  2:create vm
  3:delete vm

  
  Actual result
  =============

  Database changed
  MariaDB [nova_api]> select * from instance_group_member where group_id='3';
  
+---------------------+------------+-----+--------------------------------------+----------+
  | created_at          | updated_at | id  | instance_uuid                      
  | group_id |
  
+---------------------+------------+-----+--------------------------------------+----------+
  | 2018-02-12 09:14:42 | NULL       | 106 | 
3b9aa471-612f-4967-a405-574241e84aa0 |        3 |
  | 2018-02-12 09:15:14 | NULL       | 107 | 
e04244d9-2832-482a-9793-b5cc5b018de2 |        3 |
  | 2018-02-22 03:05:40 | NULL       | 108 | 
ff7a2194-9f38-4a7e-a67f-f0c53e409e9b |        3 |
  | 2018-02-22 04:07:43 | NULL       | 109 | 
50000a55-8d0f-4592-ae0f-e9223c3f6a32 |        3 |
  | 2018-02-22 08:36:44 | NULL       | 110 | 
4ef31c5c-d96f-4e24-ba86-75c5576ae4ed |        3 |
  | 2018-02-22 09:36:39 | NULL       | 111 | 
0378c1bb-2d79-4b33-8115-77a75996af38 |        3 |
  | 2018-02-23 00:40:05 | NULL       | 112 | 
08dac72d-8f04-4f7d-8b9a-60b0cf000951 |        3 |
  
+---------------------+------------+-----+--------------------------------------+----------+
  7 rows in set (0.00 sec)

  MariaDB [nova_api]> use nova;
  Reading table information for completion of table and column names
  You can turn off this feature to get a quicker startup with -A

  Database changed
  MariaDB [nova]> select * from instances where 
uuid='3b9aa471-612f-4967-a405-574241e84aa0';
  
+---------------------+---------------------+---------------------+-----+-------------+----------------------------------+----------------------------------+--------------------------------------+-----------+------------+--------------+----------+----------+-------------+----------+-----------+-------+------------+-------------+-----------+----------------+---------------------+---------------------+--------------+---------------------+-------------------+--------+---------+-------------+------------------+---------+--------------------------------------+--------------+------------------+--------------+--------------+--------------+------------+--------------------------+---------------------+----------+------------------+--------------------+-------------------+---------+--------------+-----------+-------------+---------+-----------+---------+--------------------+
  | created_at          | updated_at          | deleted_at          | id  | 
internal_id | user_id                          | project_id                     
  | image_ref                            | kernel_id | ramdisk_id | 
launch_index | key_name | key_data | power_state | vm_state | memory_mb | vcpus 
| hostname   | host        | user_data | reservation_id | launched_at         | 
terminated_at       | display_name | display_description | availability_zone | 
locked | os_type | launched_on | instance_type_id | vm_mode | uuid              
                   | architecture | root_device_name | access_ip_v4 | 
access_ip_v6 | config_drive | task_state | default_ephemeral_device | 
default_swap_device | progress | auto_disk_config | shutdown_terminate | 
disable_terminate | root_gb | ephemeral_gb | cell_name | node        | deleted 
| locked_by | cleaned | ephemeral_key_uuid |
  
+---------------------+---------------------+---------------------+-----+-------------+----------------------------------+----------------------------------+--------------------------------------+-----------+------------+--------------+----------+----------+-------------+----------+-----------+-------+------------+-------------+-----------+----------------+---------------------+---------------------+--------------+---------------------+-------------------+--------+---------+-------------+------------------+---------+--------------------------------------+--------------+------------------+--------------+--------------+--------------+------------+--------------------------+---------------------+----------+------------------+--------------------+-------------------+---------+--------------+-----------+-------------+---------+-----------+---------+--------------------+
  | 2018-02-12 09:14:42 | 2018-02-13 00:58:48 | 2018-02-13 00:58:48 | 255 |     
   NULL | 86019a90ad0b44609cca8b0eb9eee79b | 01f2572fd19743558be05561e09c3850 | 
22164f51-c353-4f8a-a073-cbb2930bf25f |           |            |            0 | 
NULL     | NULL     |           0 | deleted  |      2048 |     1 | test-tx001 | 
nail-5300-2 | NULL      | r-j42bg7io     | 2018-02-12 09:14:56 | 2018-02-13 
00:58:48 | test_tx001   | NULL                | test1             |      0 | 
NULL    | nail-5300-2 |               14 | NULL    | 
3b9aa471-612f-4967-a405-574241e84aa0 | NULL         | /dev/vda         | NULL   
      | NULL         |              | NULL       | NULL                     | 
NULL                |        0 |                0 |                  0 |        
         0 |      10 |            0 | NULL      | nail-5300-2 |     255 | NULL  
    |       1 | NULL               |
  
+---------------------+---------------------+---------------------+-----+-------------+----------------------------------+----------------------------------+--------------------------------------+-----------+------------+--------------+----------+----------+-------------+----------+-----------+-------+------------+-------------+-----------+----------------+---------------------+---------------------+--------------+---------------------+-------------------+--------+---------+-------------+------------------+---------+--------------------------------------+--------------+------------------+--------------+--------------+--------------+------------+--------------------------+---------------------+----------+------------------+--------------------+-------------------+---------+--------------+-----------+-------------+---------+-----------+---------+--------------------+
  1 row in set (0.00 sec)

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