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[Launchpad Bug Tracker <1644186@xxxxxxxxxxxxxxxxxx>]

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1644186

Title:
  nova service performs wrong update from version 15 to 9

Status in OpenStack Compute (nova):
  Expired

Bug description:
  We are running openstack mitaka out of clean installation (no upgrade).
  All was functioning correctly until recently nova started to perform updates like this

  2016-11-23 10:48:09.065 17498 INFO nova.service [req-c91ec40f-2dc2 - -
  - - -] Updating service version for nova-conductor on nova-
  tlc01.specs.de from 15 to 9

  The full error log from /var/log/nova/nova-conductor.log looks like

  2016-11-23 10:48:08.967 17499 INFO nova.service [-] Starting conductor node (version 13.1.2)
  2016-11-23 10:48:09.065 17498 INFO nova.service [req-c91ec40f-2dc2- - - - - -] Updating service version for nova-conductor on nova-tlc01.specs.de from 15 to 9
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service [req-c91ec40f-2dc2-4ab0-ad61-1ab1f9d7bbc9 - - - - -] Error starting thread.
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service Traceback (most recent call last):
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service   File "/usr/lib/python2.7/dist-packages/oslo_service/service.py", line 680, in run_service
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service     service.start()
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service   File "/usr/lib/python2.7/dist-packages/nova/service.py", line 195, in start
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service     _update_service_ref(self.service_ref)
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service   File "/usr/lib/python2.7/dist-packages/nova/service.py", line 151, in _update_service_ref
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service     service.save()
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service   File "/usr/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 223, in wrapper
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service     return fn(self, *args, **kwargs)
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service   File "/usr/lib/python2.7/dist-packages/nova/objects/service.py", line 291, in save
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service     self._check_minimum_version()
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service   File "/usr/lib/python2.7/dist-packages/nova/objects/service.py", line 275, in _check_minimum_version
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service     minver=minver)
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service ServiceTooOld: This service is older (v9) than the minimum (v15) version of the rest of the deployment. Unable to continue.
  2016-11-23 10:48:09.068 17498 ERROR oslo_service.service

  I checked the changes in recent versions of nova/service.py
  https://fossies.org/diffs/nova/13.1.1_vs_13.1.2/nova/service.py-diff.html

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