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[Elod Illes <1881727@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/ussuri
   Importance: Undecided
       Status: New

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Changed in: nova/ussuri
       Status: New => Fix Committed

** Changed in: nova/train
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1881727

Title:
  Nova retains the 'delta' file for the entire snapshot upload time

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

Bug description:
  When the live snapshot happens it setups a 100% copy of the original
  file using libvirt/qemu to sync the disk to it using "Shallow" mode
  (this is the .delta file). From that .delta file it extracts the image
  and uploads it. The delta file remains till the upload completes which
  results in 3x space required for each snapshots.

  To fix this issue, the .delta file can be removed once the image is
  extracted from the .delta file
  https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/driver.py#L2007-L2008

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