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[Belmiro Moreira <1286527@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After Grizzly -> Havana upgrade the quota_usages table was 
wiped out due to bug #1245746

Quota_usages is then updated after a user creates/delete an instance.
The problem is that quota_usages is updated per user in a tenant.

For tenants that are shared by different users this means that users that 
didn't have created instances previous are able to use the full quota for the tenant.

Example:
instance quota for tenant_X = 10
user_a and user_b can create instances in tenant_X

 - user_a creates 8 instances;
 - user_b didn't have instances;
 - grizzly -> havana upgrade (usage_quotas wipe)
 - user_b is able to create 10 instances
Problematic for clouds that rely in tenant quotas and not billing directly users.

Even if previous example is associated with bug #1245746
this can happen if a user quota usage for a tenant gets out of sync.


Quota usages should be updated and sync considering all resources in the tenant and 
not only the resources of the user that is doing the request.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1286527

Title:
  Quota usages update should check all usage in tenant not only per user

Status in OpenStack Compute (Nova):
  New

Bug description:
  After Grizzly -> Havana upgrade the quota_usages table was 
  wiped out due to bug #1245746

  Quota_usages is then updated after a user creates/delete an instance.
  The problem is that quota_usages is updated per user in a tenant.

  For tenants that are shared by different users this means that users that 
  didn't have created instances previous are able to use the full quota for the tenant.

  Example:
  instance quota for tenant_X = 10
  user_a and user_b can create instances in tenant_X

   - user_a creates 8 instances;
   - user_b didn't have instances;
   - grizzly -> havana upgrade (usage_quotas wipe)
   - user_b is able to create 10 instances
  Problematic for clouds that rely in tenant quotas and not billing directly users.

  Even if previous example is associated with bug #1245746
  this can happen if a user quota usage for a tenant gets out of sync.

  
  Quota usages should be updated and sync considering all resources in the tenant and 
  not only the resources of the user that is doing the request.

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