Hi,
Anyone else encounter the following exception:

+ /usr/local/bin/neutron-db-manage --config-file /etc/neutron/neutron.conf 
--config-file /etc/neutron/plugins/ml2/ml2_conf.ini upgrade head
No handlers could be found for logger "neutron.common.legacy"
INFO  [alembic.migration] Context impl MySQLImpl.
INFO  [alembic.migration] Will assume non-transactional DDL.
INFO  [alembic.migration] Running upgrade None -> folsom, folsom initial 
database
INFO  [alembic.migration] Running upgrade folsom -> 2c4af419145b, l3_support
INFO  [alembic.migration] Running upgrade 2c4af419145b -> 5a875d0e5c, ryu
INFO  [alembic.migration] Running upgrade 5a875d0e5c -> 48b6f43f7471, DB 
support for service types
INFO  [alembic.migration] Running upgrade 48b6f43f7471 -> 3cb5d900c5de, 
security_groups
INFO  [alembic.migration] Running upgrade 3cb5d900c5de -> 1d76643bcec4, 
nvp_netbinding
INFO  [alembic.migration] Running upgrade 1d76643bcec4 -> 2a6d0b51f4bb, cisco 
plugin cleanup
INFO  [alembic.migration] Running upgrade 2a6d0b51f4bb -> 1b693c095aa3, Quota 
ext support added in Grizzly
INFO  [alembic.migration] Running upgrade 1b693c095aa3 -> 1149d7de0cfa, inital 
port security
INFO  [alembic.migration] Running upgrade 1149d7de0cfa -> 49332180ca96, ryu 
plugin update
INFO  [alembic.migration] Running upgrade 49332180ca96 -> 38335592a0dc, 
nvp_portmap
INFO  [alembic.migration] Running upgrade 38335592a0dc -> 54c2c487e913, 'DB 
support for load balancing service
INFO  [alembic.migration] Running upgrade 54c2c487e913 -> 45680af419f9, nvp_qos
INFO  [alembic.migration] Running upgrade 45680af419f9 -> 1c33fa3cd1a1, Support 
routing table configuration on Router
INFO  [alembic.migration] Running upgrade 1c33fa3cd1a1 -> 363468ac592c, 
nvp_network_gw
INFO  [alembic.migration] Running upgrade 363468ac592c -> 511471cc46b, Add 
agent management extension model support
INFO  [alembic.migration] Running upgrade 511471cc46b -> 3b54bf9e29f7, NEC 
plugin sharednet
INFO  [alembic.migration] Running upgrade 3b54bf9e29f7 -> 4692d074d587, agent 
scheduler
INFO  [alembic.migration] Running upgrade 4692d074d587 -> 1341ed32cc1e, 
nvp_net_binding
INFO  [alembic.migration] Running upgrade 1341ed32cc1e -> grizzly, grizzly
INFO  [alembic.migration] Running upgrade grizzly -> f489cf14a79c, DB support 
for load balancing service (havana)
INFO  [alembic.migration] Running upgrade f489cf14a79c -> 176a85fc7d79, Add 
portbindings db
INFO  [alembic.migration] Running upgrade 176a85fc7d79 -> 32b517556ec9, remove 
TunnelIP model
INFO  [alembic.migration] Running upgrade 32b517556ec9 -> 128e042a2b68, 
ext_gw_mode
INFO  [alembic.migration] Running upgrade 128e042a2b68 -> 5ac71e65402c, 
ml2_initial
INFO  [alembic.migration] Running upgrade 5ac71e65402c -> 3cbf70257c28, 
nvp_mac_learning
INFO  [alembic.migration] Running upgrade 3cbf70257c28 -> 5918cbddab04, add 
tables for router rules support
INFO  [alembic.migration] Running upgrade 5918cbddab04 -> 3cabb850f4a5, Table 
to track port to host associations
INFO  [alembic.migration] Running upgrade 3cabb850f4a5 -> b7a8863760e, Remove 
cisco_vlan_bindings table
INFO  [alembic.migration] Running upgrade b7a8863760e -> 13de305df56e, 
nec_add_pf_name
INFO  [alembic.migration] Running upgrade 13de305df56e -> 20ae61555e95, DB 
Migration for ML2 GRE Type Driver
INFO  [alembic.migration] Running upgrade 20ae61555e95 -> 477a4488d3f4, DB 
Migration for ML2 VXLAN Type Driver
INFO  [alembic.migration] Running upgrade 477a4488d3f4 -> 2032abe8edac, LBaaS 
add status description
INFO  [alembic.migration] Running upgrade 2032abe8edac -> 52c5e4a18807, LBaaS 
Pool scheduler
INFO  [alembic.migration] Running upgrade 52c5e4a18807 -> 557edfc53098, New 
service types framework (service providers)
INFO  [alembic.migration] Running upgrade 557edfc53098 -> e6b16a30d97, Add 
cisco_provider_networks table
INFO  [alembic.migration] Running upgrade e6b16a30d97 -> 39cf3f799352, FWaaS 
Havana-2 model
INFO  [alembic.migration] Running upgrade 39cf3f799352 -> 52ff27f7567a, Support 
for VPNaaS
INFO  [alembic.migration] Running upgrade 52ff27f7567a -> 11c6e18605c8, Pool 
Monitor status field
INFO  [alembic.migration] Running upgrade 11c6e18605c8 -> 35c7c198ddea, remove 
status from HealthMonitor
INFO  [alembic.migration] Running upgrade 35c7c198ddea -> 263772d65691, Cisco 
plugin db cleanup part II
INFO  [alembic.migration] Running upgrade 263772d65691 -> c88b6b5fea3, Cisco 
N1KV tables
INFO  [alembic.migration] Running upgrade c88b6b5fea3 -> f9263d6df56, 
remove_dhcp_lease
INFO  [alembic.migration] Running upgrade f9263d6df56 -> 569e98a8132b, metering
INFO  [alembic.migration] Running upgrade 569e98a8132b -> 86cf4d88bd3, remove 
bigswitch port tracking table
INFO  [alembic.migration] Running upgrade 86cf4d88bd3 -> 3c6e57a23db4, add 
multiprovider
INFO  [alembic.migration] Running upgrade 3c6e57a23db4 -> 63afba73813, Add 
unique constraint for id column of TunnelEndpoint
INFO  [alembic.migration] Running upgrade 63afba73813 -> 40dffbf4b549, 
nvp_dist_router
INFO  [alembic.migration] Running upgrade 40dffbf4b549 -> 53bbd27ec841, Extra 
dhcp opts support
INFO  [alembic.migration] Running upgrade 53bbd27ec841 -> 46a0efbd8f0, 
cisco_n1kv_multisegment_trunk
INFO  [alembic.migration] Running upgrade 46a0efbd8f0 -> 2a3bae1ceb8, NEC Port 
Binding
INFO  [alembic.migration] Running upgrade 2a3bae1ceb8 -> 14f24494ca31, DB 
Migration for Arista ml2 mechanism driver
INFO  [alembic.migration] Running upgrade 14f24494ca31 -> 32a65f71af51, ml2 
portbinding
INFO  [alembic.migration] Running upgrade 32a65f71af51 -> 66a59a7f516, NEC 
OpenFlow Router
INFO  [alembic.migration] Running upgrade 66a59a7f516 -> 51b4de912379, Cisco 
Nexus ML2 mechanism driver
INFO  [alembic.migration] Running upgrade 51b4de912379 -> 1efb85914233, 
allowedaddresspairs
INFO  [alembic.migration] Running upgrade 1efb85914233 -> 38fc1f6789f8, Cisco 
N1KV overlay support
INFO  [alembic.migration] Running upgrade 38fc1f6789f8 -> 4a666eb208c2, service 
router
INFO  [alembic.migration] Running upgrade 4a666eb208c2 -> 338d7508968c, vpnaas 
peer_address size increase
INFO  [alembic.migration] Running upgrade 338d7508968c -> 3ed8f075e38a, nvp 
fwaas plugin
INFO  [alembic.migration] Running upgrade 3ed8f075e38a -> 3d6fae8b70b0, nvp 
lbaas plugin
INFO  [alembic.migration] Running upgrade 3d6fae8b70b0 -> 1064e98b7917, 
nec-pf-port-del
INFO  [alembic.migration] Running upgrade 1064e98b7917 -> 2528ceb28230, NEC 
PacketFilter network_id nullable fix
INFO  [alembic.migration] Running upgrade 2528ceb28230 -> 3a520dd165d0, Cisco 
Nexus multi-switch
INFO  [alembic.migration] Running upgrade 3a520dd165d0 -> 27ef74513d33, 
quota_in_plumgrid_plugin
INFO  [alembic.migration] Running upgrade 27ef74513d33 -> havana, havana
INFO  [alembic.migration] Running upgrade havana -> e197124d4b9, add unique 
constraint to members
INFO  [alembic.migration] Running upgrade e197124d4b9 -> 1fcfc149aca4, Add a 
unique constraint on (agent_type, host) columns to prevent a race
condition when an agent entry is 'upserted'.
Traceback (most recent call last):
  File "/usr/local/bin/neutron-db-manage", line 10, in <module>
    sys.exit(main())
  File "/opt/stack/neutron/neutron/db/migration/cli.py", line 143, in main
    CONF.command.func(config, CONF.command.name)
  File "/opt/stack/neutron/neutron/db/migration/cli.py", line 80, in 
do_upgrade_downgrade
    do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
  File "/opt/stack/neutron/neutron/db/migration/cli.py", line 59, in 
do_alembic_command
    getattr(alembic_command, cmd)(config, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 124, 
in upgrade
    script.run_env()
  File "/usr/local/lib/python2.7/dist-packages/alembic/script.py", line 199, in 
run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/local/lib/python2.7/dist-packages/alembic/util.py", line 198, in 
load_python_file
    module = load_module(module_id, path)
  File "/usr/local/lib/python2.7/dist-packages/alembic/compat.py", line 55, in 
load_module
    mod = imp.load_source(module_id, path, fp)
  File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/env.py", 
line 105, in <module>
    run_migrations_online()
  File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/env.py", 
line 89, in run_migrations_online
    options=build_options())
  File "<string>", line 7, in run_migrations
  File "/usr/local/lib/python2.7/dist-packages/alembic/environment.py", line 
652, in run_migrations
    self.get_context().run_migrations(**kw)
  File "/usr/local/lib/python2.7/dist-packages/alembic/migration.py", line 225, 
in run_migrations
    change(**kw)
  File 
"/opt/stack/neutron/neutron/db/migration/alembic_migrations/versions/1fcfc149aca4_agents_unique_by_type_and_host.py",
 line 50, in upgrade
    local_cols=['agent_type', 'host']
  File "<string>", line 7, in create_unique_constraint
  File "/usr/local/lib/python2.7/dist-packages/alembic/operations.py", line 
544, in create_unique_constraint
    schema=schema, **kw)
  File "/usr/local/lib/python2.7/dist-packages/alembic/ddl/impl.py", line 135, 
in add_constraint
    self._exec(schema.AddConstraint(const))
  File "/usr/local/lib/python2.7/dist-packages/alembic/ddl/impl.py", line 76, 
in _exec
    conn.execute(construct, *multiparams, **params)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 
1449, in execute
    params)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 
1542, in _execute_ddl
    compiled
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 
1698, in _execute_context
    context)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 
1691, in _execute_context
    context)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", 
line 331, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in 
execute
    self.errorhandler(self, exc, value)
  File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in 
defaulterrorhandler
    raise errorclass, errorvalue
sqlalchemy.exc.ProgrammingError: (ProgrammingError) (1146, "Table 
'neutron_ml2.agents' doesn't exist") 'ALTER TABLE agents ADD CONSTRAINT 
uniq_agents0agent_type0host UNIQUE (agent_type, host)' ()

Thanks
Gary
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