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[Joe Gordon <1276530@xxxxxxxxxxxxxxxxxx>]

memorycache is synced in from oslo-incubator so the fix has to go there
first.

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

** Changed in: oslo
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1276530

Title:
  memorycache#get scans the whole cache for expired items on every fetch

Status in OpenStack Compute (Nova):
  In Progress
Status in Oslo - a Library of Common OpenStack Code:
  Confirmed

Bug description:
  Every time an item is fetched from the memory cache, the whole cache
  is scanned for expired items:

  https://github.com/openstack/nova/blob/master/nova/openstack/common/memorycache.py#L63-L67

  This is not the right place to expire items - a large cache can become
  slow.  There should be a periodic task to take care of expired items.

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