** Changed in: neutron
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1464825

Title:
  alembic migration script for vpnaas error

Status in neutron:
  Invalid

Bug description:
  
  56893333aa52_fix_identifier_map_fk.py alembic migration script error 'Cannot 
change column 'ipsec_site_conn_id': used in a foreign key constraint 
'cisco_csr_identifier_map_ibfk_1'


  + /usr/bin/neutron-db-manage --service vpnaas --config-file 
/etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini 
upgrade head
  INFO  [alembic.migration] Context impl MySQLImpl.
  INFO  [alembic.migration] Will assume non-transactional DDL.
  INFO  [alembic.migration] Context impl MySQLImpl.
  INFO  [alembic.migration] Will assume non-transactional DDL.
  INFO  [alembic.migration] Running upgrade  -> start_neutron_vpnaas, start 
neutron-vpnaas chain
  INFO  [alembic.migration] Running upgrade start_neutron_vpnaas -> 
3ea02b2a773e, add_index_tenant_id
  INFO  [alembic.migration] Running upgrade 3ea02b2a773e -> kilo, kilo
  INFO  [alembic.migration] Running upgrade kilo -> 56893333aa52, fix 
identifier map fk
  Traceback (most recent call last):
    File "/usr/bin/neutron-db-manage", line 10, in <module>
      sys.exit(main())
    File "/opt/stack/neutron/neutron/db/migration/cli.py", line 238, in main
      CONF.command.func(config, CONF.command.name)
    File "/opt/stack/neutron/neutron/db/migration/cli.py", line 106, in 
do_upgrade
      do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
    File "/opt/stack/neutron/neutron/db/migration/cli.py", line 72, in 
do_alembic_command
      getattr(alembic_command, cmd)(config, *args, **kwargs)
    File "/usr/lib/python2.7/site-packages/alembic/command.py", line 165, in 
upgrade
      script.run_env()
    File "/usr/lib/python2.7/site-packages/alembic/script.py", line 390, in 
run_env
      util.load_python_file(self.dir, 'env.py')
    File "/usr/lib/python2.7/site-packages/alembic/util.py", line 243, in 
load_python_file
      module = load_module_py(module_id, path)
    File "/usr/lib/python2.7/site-packages/alembic/compat.py", line 79, in 
load_module_py
      mod = imp.load_source(module_id, path, fp)
    File 
"/opt/stack/neutron-vpnaas/neutron_vpnaas/db/migration/alembic_migrations/env.py",
 line 86, in <module>
      run_migrations_online()
    File 
"/opt/stack/neutron-vpnaas/neutron_vpnaas/db/migration/alembic_migrations/env.py",
 line 77, in run_migrations_online
      context.run_migrations()
    File "<string>", line 7, in run_migrations
    File "/usr/lib/python2.7/site-packages/alembic/environment.py", line 738, 
in run_migrations
      self.get_context().run_migrations(**kw)
    File "/usr/lib/python2.7/site-packages/alembic/migration.py", line 309, in 
run_migrations
      step.migration_fn(**kw)
    File 
"/opt/stack/neutron-vpnaas/neutron_vpnaas/db/migration/alembic_migrations/versions/56893333aa52_fix_identifier_map_fk.py",
 line 48, in upgrade
      existing_nullable=True)
    File "<string>", line 7, in alter_column
    File "<string>", line 1, in <lambda>
    File "/usr/lib/python2.7/site-packages/alembic/util.py", line 388, in go
      return fn(*arg, **kw)
    File "/usr/lib/python2.7/site-packages/alembic/operations.py", line 478, in 
alter_column
      existing_autoincrement=existing_autoincrement
    File "/usr/lib/python2.7/site-packages/alembic/ddl/mysql.py", line 65, in 
alter_column
      else existing_autoincrement
    File "/usr/lib/python2.7/site-packages/alembic/ddl/impl.py", line 122, in 
_exec
      return conn.execute(construct, *multiparams, **params)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 
841, in execute
      return meth(self, multiparams, params)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/sql/ddl.py", line 69, 
in _execute_on_connection
      return connection._execute_ddl(self, multiparams, params)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 
895, in _execute_ddl
      compiled
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 
1070, in _execute_context
      context)
    File 
"/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/compat/handle_error.py", 
line 155, in _handle_dbapi_exception
      e, statement, parameters, cursor, context)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 
1267, in _handle_dbapi_exception
      util.raise_from_cause(newraise, exc_info)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/compat.py", line 
199, in raise_from_cause
      reraise(type(exception), exception, tb=exc_tb)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 
1063, in _execute_context
      context)
    File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/default.py", 
line 442, in do_execute
      cursor.execute(statement, parameters)
    File "/usr/lib64/python2.7/site-packages/MySQLdb/cursors.py", line 174, in 
execute
      self.errorhandler(self, exc, value)
    File "/usr/lib64/python2.7/site-packages/MySQLdb/connections.py", line 36, 
in defaulterrorhandler
      raise errorclass, errorvalue
  sqlalchemy.exc.OperationalError: (OperationalError) (1832, "Cannot change 
column 'ipsec_site_conn_id': used in a foreign key constraint 
'cisco_csr_identifier_map_ibfk_1'") 'ALTER TABLE cisco_csr_identifier_map 
MODIFY ipsec_site_conn_id VARCHAR(36) NULL' ()

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