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[HenryShen <shenhui2@xxxxxxxxxx>]

Public bug reported:

\nova\db\sqlalchemy\api.py   quota_reserve()

when decided whether to refresh the user_usages[resource], one rule is
that if the last refresh was too long time ago, we need refresh
user_usages[resource].

 elif max_age and (user_usages[resource].updated_at -
                              timeutils.utcnow()).seconds >= max_age:

using last update time minus current time result in a overflow ,so that
the refresh action always be executed,in consideration of the max_age
won't be a max number.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1363324

Title:
  a bug in quota check

Status in OpenStack Compute (Nova):
  New

Bug description:
  \nova\db\sqlalchemy\api.py   quota_reserve()

  when decided whether to refresh the user_usages[resource], one rule is
  that if the last refresh was too long time ago, we need refresh
  user_usages[resource].

   elif max_age and (user_usages[resource].updated_at -
                                timeutils.utcnow()).seconds >= max_age:

  using last update time minus current time result in a overflow ,so
  that the refresh action always be executed,in consideration of the
  max_age won't be a max number.

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