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[OpenStack Infra <1864641@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/709770
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=9e416224b04d7d4094e5719afa4ef5bccbe48ce7
Submitter: Zuul
Branch:    master

commit 9e416224b04d7d4094e5719afa4ef5bccbe48ce7
Author: Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>
Date:   Tue Feb 25 15:14:54 2020 +0000

    [OVN] OVN DB schema update aware maintenance tasks
    
    This patch introduces a new mechanism to allow rerunning maintenance
    tasks upon an OVN database schema change to avoid a service restart.
    
    As an example, the "migrate_to_port_groups" maintenance task will run
    again when the database schema is updated. In case of a migration from
    an OVN version without port groups support to a version that supports
    it, the OVN driver will migrate the code automatically without the need
    of a service restart.
    
    Closes-Bug: #1864641
    Change-Id: I520a3de105b4c6924908e099a3b8d60c3280f499
    Signed-off-by: Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1864641

Title:
  [OVN] Run maintenance task whenever the OVN DB schema has been
  upgraded

Status in neutron:
  Fix Released

Bug description:
  When OVN DBs are upgraded (and restarted), there might be cases
  whenever we want to accommodate things to a new schema. In this
  situation we don't want to force a restart of neutron-server (or
  metadata agent) but instead, detect it and run whatever is needed.

  This can be achieved by checking the schema version via ovsdbapp [0]
  and comparing if it's bigger than what we had upon a reconnection to
  the OVN DBs.

  [0]
  https://github.com/openvswitch/ovs/blob/master/python/ovs/db/schema.py#L35

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