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[AiQingxing <aiqingxing@xxxxxxxxxx>]

Public bug reported:

When a user upload several images at the same time,the storage usage of him may exceed the quota limit.
See sample here:
In glance/glance/api/v1/upload_utils.py  Line123   2014/9/12
The Process has finished upload and pass the second quota check,But not yet writes the size to the database.When another process finishes uploading,It will also pass the quota check.
Here's a case：
user_storage_quota = 20 MB,Upload 2 Images which size are both 17MB.
Let the first process sleep 50 seconds before writes the size to the database,The two Images all successful uploaded and returned to user.
Now,My user_storage_quota = 10GB But I have 10 images,every image's size is 8G

** Affects: glance
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1368516

Title:
  Quota Error In the Case of Parallel Execute

Status in OpenStack Image Registry and Delivery Service (Glance):
  New

Bug description:
  When a user upload several images at the same time,the storage usage of him may exceed the quota limit.
  See sample here:
  In glance/glance/api/v1/upload_utils.py  Line123   2014/9/12
  The Process has finished upload and pass the second quota check,But not yet writes the size to the database.When another process finishes uploading,It will also pass the quota check.
  Here's a case：
  user_storage_quota = 20 MB,Upload 2 Images which size are both 17MB.
  Let the first process sleep 50 seconds before writes the size to the database,The two Images all successful uploaded and returned to user.
  Now,My user_storage_quota = 10GB But I have 10 images,every image's size is 8G

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