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[Zhenyu Zheng <zhengzhenyu@xxxxxxxxxx>]

Public bug reported:

Currently, the quota usage table doesn't contain UniqueConstraint
policy. Although it has locks when writing data, but nova-api allows
multiple workers. Under extreme circumstance, for example: multiple api
workers are trying to read and write the table at the same time, new
record may be recorded to the list for the same user and same resources.

** Affects: nova
     Importance: Undecided
     Assignee: Zhenyu Zheng (zhengzhenyu)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Zhenyu Zheng (zhengzhenyu)

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

Title:
  Race conditions for quota_usage tabel

Status in OpenStack Compute (nova):
  New

Bug description:
  Currently, the quota usage table doesn't contain UniqueConstraint
  policy. Although it has locks when writing data, but nova-api allows
  multiple workers. Under extreme circumstance, for example: multiple
  api workers are trying to read and write the table at the same time,
  new record may be recorded to the list for the same user and same
  resources.

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