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[OpenStack Infra <1754071@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/567522
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1c56ef6b5db25b78e515fbe6a12a8dedefbd6941
Submitter: Zuul
Branch:    master

commit 1c56ef6b5db25b78e515fbe6a12a8dedefbd6941
Author: jichen <jichenjc@xxxxxxxxxx>
Date:   Thu May 10 16:53:51 2018 +0800

    Avoid warning log when image not exist
    
    when doing snapshot nova try to get image info and
    normal case is image doesn't exist but nova shows
    a warning log ,this patch change the mechanism to
    only log unexpected exception as warning.
    
    Change-Id: I49618a6dafbe00b9516ff37172b6aea68a42deba
    Closes-Bug: 1754071


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

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https://bugs.launchpad.net/bugs/1754071

Title:
  image not found warning in logs when instance is deleted during
  snapshot

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Related to bug 1722571 (and bug 1737024), when an instance is deleted
  while nova is creating an image of it, there is some cleanup code in
  the compute manager that tries to delete the image, which might not
  exist, and we log a warning:

  http://logs.openstack.org/74/511074/6/check/tempest-
  full/39df584/controller/logs/screen-n-cpu.txt#_Mar_06_23_34_23_166597

  Mar 06 23:34:23.058201 ubuntu-xenial-rax-dfw-0002817722 nova-compute[12626]: INFO nova.virt.libvirt.driver [None req-fcf19cc8-3566-4f62-9d8a-6e9733fd0bef tempest-ImagesTestJSON-1528672258 tempest-ImagesTestJSON-1528672258] [instance: 5946fa5a-f91f-4878-8cc1-fc6e248ef38b] Deletion of /opt/stack/data/nova/instances/5946fa5a-f91f-4878-8cc1-fc6e248ef38b_del complete
  Mar 06 23:34:23.116179 ubuntu-xenial-rax-dfw-0002817722 nova-compute[12626]: INFO nova.virt.libvirt.driver [None req-fcf19cc8-3566-4f62-9d8a-6e9733fd0bef tempest-ImagesTestJSON-1528672258 tempest-ImagesTestJSON-1528672258] [instance: 5946fa5a-f91f-4878-8cc1-fc6e248ef38b] Instance instance-00000022 disappeared while taking snapshot of it: [Error Code 42] Domain not found: no domain with matching uuid '5946fa5a-f91f-4878-8cc1-fc6e248ef38b' (instance-00000022)
  Mar 06 23:34:23.116411 ubuntu-xenial-rax-dfw-0002817722 nova-compute[12626]: DEBUG nova.compute.manager [None req-fcf19cc8-3566-4f62-9d8a-6e9733fd0bef tempest-ImagesTestJSON-1528672258 tempest-ImagesTestJSON-1528672258] [instance: 5946fa5a-f91f-4878-8cc1-fc6e248ef38b] Instance disappeared during snapshot {{(pid=12626) _snapshot_instance /opt/stack/nova/nova/compute/manager.py:3372}}
  Mar 06 23:34:23.166597 ubuntu-xenial-rax-dfw-0002817722 nova-compute[12626]: WARNING nova.compute.manager [None req-fcf19cc8-3566-4f62-9d8a-6e9733fd0bef tempest-ImagesTestJSON-1528672258 tempest-ImagesTestJSON-1528672258] [instance: 5946fa5a-f91f-4878-8cc1-fc6e248ef38b] Error while trying to clean up image 263b517a-3fc0-4486-a292-9cf8a4865282: ImageNotFound: Image 263b517a-3fc0-4486-a292-9cf8a4865282 could not be found.

  That warning comes from this code:

  https://github.com/openstack/nova/blob/489a8f5bf3e50944ced253283c15e77310a56e40/nova/compute/manager.py#L3378

  We should be able to handle an ImageNotFound exception specifically in
  that try/except block and not log a warning for it.

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