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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => juno-rc1

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https://bugs.launchpad.net/bugs/1298420

Title:
  Libvirt's image caching fetches images multiple times

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  When launching several VMs in rapid succession, it is possible that
  libvirt's image caching will fetch the same image several times.  This
  can occur when all of the VMs in question are using the same base
  image and this base image has not been previously fetched. The inline
  fetch_func_sync method prevents multiple threads from fetching the
  same image at the same time, but it does not prevent a thread that is
  waiting to acquire the lock from fetching the image that was being
  fetched while the lock was still in use. This is because the presence
  of the image is checked only before the lock has been acquired, not
  after.

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