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[Rodolfo Alonso <1566520@xxxxxxxxxxxxxxxxxx>]

Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: In Progress => Won't Fix

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Title:
  [RFE] Upgrade controllers with no API downtime

Status in neutron:
  Won't Fix

Bug description:
  Currently pretty much every major upgrade requires full shutdown for
  all neutron-server instances for the time while upgrade process is
  running. The downtime is due to the need to run alembic scripts that
  modify schema and transform data. Neutron-server instances are
  currently not resilient to working with older schema. We also don't
  make an effort to avoid 'contract' migrations.

  The goal of the RFE is to allow upgrading controller services one by
  one, without full shutdown for all of them in an HA setup. This will
  allow to avoid public shutdown for API for rolling upgrades.

  The RFE involves:
  - adopting object facades for all interaction with database models;
  - forbidding contract migrations in alembic;
  - implementing new contract migrations in backwards compatible way in runtime.

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