Drop support for SQL Schema Downgrades
SQL Schema Downgrades are no longer supported. This commit removes downgrade function from octavia-db-manage. Related cross-project spec: https://review.openstack.org/152337 Partial-Bug: #1434103 Change-Id: I0304d19ebb2de3a596c9f62825e664267ad60dd8
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HACKING.rst
13
HACKING.rst
@ -100,19 +100,6 @@ effort to allow for Neutron LBaaS API deprecation of URIs. The rationale is
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that Neutron LBaaS API users should have the ability to transition from one
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version to the next easily.
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Upgrade and downgrade migrations will be supported
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--------------------------------------------------
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Whenever large operators conduct upgrades it is important to have a backup
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plan in the form of downgrades. While upgrade migrations are commonplace,
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often, downgrade migrations are ignored. Octavia will support migrations that
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allow for seamless version to version upgrades/downgrades within the scope of a
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major version.
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For example, assume that an operator is currently hosting version 1.0 of
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Octavia and wants to upgrade to Octavia version 1.1. A database migration will
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consist of an upgrade migration and a downgrade migration that do not fail due
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to foreign key constraints or other typical migration issues.
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Scalability and resilience are as important as functionality
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------------------------------------------------------------
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Octavia is meant to be an *operator scale* load balancer. As such, it's usually
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@ -11,6 +11,3 @@ To run migrations you must first be in the octavia/db/migration directory.
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To migrate to the most current version run:
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$ alembic upgrade head
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To downgrade one migration run:
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$ alembic downgrade -1
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@ -16,7 +16,3 @@ ${imports if imports else ""}
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def upgrade():
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${upgrades if upgrades else "pass"}
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def downgrade():
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${downgrades if downgrades else "pass"}
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@ -36,19 +36,36 @@ def do_check_migration(config, _cmd):
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do_alembic_command(config, 'branches')
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def do_upgrade_downgrade(config, cmd):
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def add_alembic_subparser(sub, cmd):
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return sub.add_parser(cmd, help=getattr(alembic_cmd, cmd).__doc__)
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def do_upgrade(config, cmd):
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if not CONF.command.revision and not CONF.command.delta:
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raise SystemExit('You must provide a revision or relative delta')
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revision = CONF.command.revision
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revision = CONF.command.revision or ''
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if '-' in revision:
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raise SystemExit(_('Negative relative revision (downgrade) not '
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'supported'))
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if CONF.command.delta:
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sign = '+' if CONF.command.name == 'upgrade' else '-'
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revision = sign + str(CONF.command.delta)
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delta = CONF.command.delta
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if delta:
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if '+' in revision:
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raise SystemExit(_('Use either --delta or relative revision, '
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'not both'))
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if delta < 0:
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raise SystemExit(_('Negative delta (downgrade) not supported'))
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revision = '%s+%d' % (revision, delta)
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do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
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def no_downgrade(config, cmd):
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raise SystemExit(_("Downgrade no longer supported"))
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def do_stamp(config, cmd):
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do_alembic_command(config, cmd,
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CONF.command.revision,
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@ -64,25 +81,30 @@ def do_revision(config, cmd):
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def add_command_parsers(subparsers):
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for name in ['current', 'history', 'branches']:
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parser = subparsers.add_parser(name)
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parser = add_alembic_subparser(subparsers, name)
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parser.set_defaults(func=do_alembic_command)
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parser = subparsers.add_parser('check_migration')
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help_text = (getattr(alembic_cmd, 'branches').__doc__ +
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' and validate head file')
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parser = subparsers.add_parser('check_migration', help=help_text)
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parser.set_defaults(func=do_check_migration)
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for name in ['upgrade', 'downgrade']:
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parser = subparsers.add_parser(name)
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parser.add_argument('--delta', type=int)
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parser.add_argument('--sql', action='store_true')
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parser.add_argument('revision', nargs='?')
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parser.set_defaults(func=do_upgrade_downgrade)
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parser = add_alembic_subparser(subparsers, 'upgrade')
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parser.add_argument('--delta', type=int)
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parser.add_argument('--sql', action='store_true')
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parser.add_argument('revision', nargs='?')
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parser.set_defaults(func=do_upgrade)
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parser = subparsers.add_parser('stamp')
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parser = subparsers.add_parser('downgrade', help="(No longer supported)")
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parser.add_argument('None', nargs='?', help="Downgrade not supported")
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parser.set_defaults(func=no_downgrade)
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parser = add_alembic_subparser(subparsers, 'stamp')
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parser.add_argument('--sql', action='store_true')
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parser.add_argument('revision')
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parser.set_defaults(func=do_stamp)
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parser = subparsers.add_parser('revision')
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parser = add_alembic_subparser(subparsers, 'revision')
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parser.add_argument('-m', '--message')
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parser.add_argument('--autogenerate', action='store_true')
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parser.add_argument('--sql', action='store_true')
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