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[Steven Hardy <shardy@xxxxxxxxxx>]

Ok so further testing this may be packaging related, as I ended up with
two versions of python-nova installed:

[root@overcloud-controller-0 ~]# rpm -ql python-nova | grep migrate_repo | grep "py$" | grep 021
/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_build_requests_instance_mediumtext.py
/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_placeholder.py
[root@overcloud-controller-0 ~]# rpm -qa | grep python-nova
python-nova-15.0.0-0.20170215034806.bdeb05d.el7.centos.noarch
python-nova-14.0.4-0.20170117154931.c6743ca.el7.centos.noarch
[root@overcloud-controller-0 ~]# rpm -qf /usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_build_requests_instance_mediumtext.py
python-nova-14.0.4-0.20170117154931.c6743ca.el7.centos.noarch
[root@overcloud-controller-0 ~]# rpm -qf /usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_placeholder.py
python-nova-15.0.0-0.20170215034806.bdeb05d.el7.centos.noarch

It's not yet clear how that happened, but I'll remove nova from this
since it appears to be an issue specific to package updates and/or the
tripleo upgrade workflow (in particular I think we can end up in this
state if an upgrade fails during the package upgrade, then the upgrade
is re-attempted).

** No longer affects: nova

** Changed in: tripleo
   Importance: Critical => High

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https://bugs.launchpad.net/bugs/1665370

Title:
  api db_sync fails on upgrade due to duplicate migration files

Status in tripleo:
  Triaged

Bug description:
  I'm testing upgrades on TripleO, and hit this problem, discussion with
  owalsh indicates it may be a nova bug related to backport migration
  numbering:

  14:44 < owalsh> shardy: it's a nova bug, 028 needs to be renamed to 021_build_requests_instance_mediumtext.py in ocata & 
                  master

  This is the error:

  "ScriptError: You can only have one Python script per version, but you
  have: /usr/lib/python2.7/site-
  packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_build_requests_instance_mediumtext.py
  and /usr/lib/python2.7/site-
  packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_placeholder.py"],
  "warnings": []}

  I'm testing this version:

  [root@overcloud-controller-0 ~]# rpm -qf /usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api_migrations/migrate_repo/versions/021_placeholder.py
  python-nova-15.0.0-0.20170215034806.bdeb05d.el7.centos.noarch

  So upgrading to:
  https://github.com/openstack/nova/commit/bdeb05dfb0f727654ac0b0bae14341fd87b5cbb7

  From stable/newton commit:
  https://github.com/openstack/nova/commit/c6743ca709d45334cf25332aa834f86a9d91f1a5

  [root@overcloud-controller-0 ~]# rpm -qa --last | grep python-nova
  python-nova-15.0.0-0.20170215034806.bdeb05d.el7.centos.noarch Wed 15 Feb 2017 07:02:12 PM UTC
  python-nova-14.0.4-0.20170117154931.c6743ca.el7.centos.noarch Mon 23 Jan 2017 01:45:50 PM UTC

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