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[Takashi Kajinami <2059800@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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, 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

** Affects: nova
     Importance: Undecided
         Status: New

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

Title:
  Image download immediately fails when glance returns 500

Status in OpenStack Compute (nova):
  New

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, 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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