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[Daniel Alvarez <1864641@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: neutron
     Importance: Undecided
         Status: New

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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:
  New

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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