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[wanghao <wanghao749@xxxxxxxxxx>]

** Also affects: cinder
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1484343

Title:
  Multiple record for same user and resource in quota_usage tabel

Status in Cinder:
  New
Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Currently, the quota usage table doesn't contain UniqueConstraint
  policy. Although it has locks when writing data, but under extreme
  circumstance, for example: launching over 100 instances at the same
  time for a new tenant(user). In this condition,the quota usage table
  for this user is empty, and there might be a chance that multiple
  record are recorded for same resource and same user.

  Adding UniqueConstraint policy for this table can solve this problem.

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