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[OpenStack Infra <1884214@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/736964
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a85753778f710f03616a682d294f8f638dea6baf
Submitter: Zuul
Branch:    master

commit a85753778f710f03616a682d294f8f638dea6baf
Author: Balazs Gibizer <balazs.gibizer@xxxxxxxx>
Date:   Fri Jun 19 11:18:04 2020 +0200

    Guard against missing image cache directory
    
    The original fix of bug 1878024 missed an edge case where on a fresh
    hypervisor the image cache directory hasn't been created yet. That
    directory is only created when the first image is downloaded.
    
    This patch makes sure that if the cache dir hasn't been created yet then
    0 disk is reserved for the cache usage instead of raising and logging an
    exception.
    
    Change-Id: Id1bbc955a9099de1abc11b9063fe177896646d03
    Related-Bug: #1878024
    Closes-Bug: #1884214


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1884214

Title:
  reserve disk usage for image cache fails on a fresh hypervisor

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) stein series:
  New
Status in OpenStack Compute (nova) train series:
  New
Status in OpenStack Compute (nova) ussuri series:
  New

Bug description:
  If the image cache _base directory does not exists on the hypervisor
  yet and [workarounds]/reserve_disk_resource_for_image_cache = True is
  set in the nova compute config then nova-compute logs a stack trace
  [1] and resource state is not update in placement.

  [1] http://paste.openstack.org/show/794993/

  This issue was reported originally in
  https://bugs.launchpad.net/nova/+bug/1878024 by MarkMielke (mark-
  mielke).

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