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[sean mooney <2059800@xxxxxxxxxxxxxxxxxx>]

** Changed in: nova
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/2059800

Title:
  Image download immediately fails when glance returns 500

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  Description
  ===========
  nova-compute downloads a vm image from glance when launching an instance. It retries requests when it gets 503, but it does not when it gets 500.
  When glance uses cinder backend and a image volume is still used (for example because another client is downloading the same image), glance returns 500 and this results in immediate instance creation failure.

  Steps to reproduce
  ==================
  * Deploy glance with cinder image store
  * Upload an image
  * Create an image-boot instance from the image, while downloading the image in background

  Expected result
  ===============
  Instance creation succeeeds

  Actual result
  =============
  Instance creation fails because of 500 error from glance

  Environment
  ===========
  This has been seen in Puppet OpenStack integration job, which uses RDO master.

  Logs & Configs
  ==============
  Example failure can be found in https://zuul.opendev.org/t/openstack/build/fc0e584a70f947d988ac057a8cc991c2

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