When enable selective distribution with PUB/SUB, the logged message is

2016-04-08 14:18:31.501 INFO dragonflow.db.api_nb [-] Pushing Update to Queue: Action:create, Table:ovsinterface, Key:61176198-5e89-4bcf-a671-17f6ce0d5397 Value:uuid:61176198-5e89-4bcf-a671-17f6ce0d5397, ofport:-1, name:tap86f8d260-37, admin_state:, type:vm, iface_id:86f8d260-375e-4549-8f81-ad4c9c1fd2a2, peer:, attached_mac:fa:16:3e:f0:c8:ac, remote_ip:, tunnel_type: Topic:None
2016-04-08 14:18:31.506 INFO dragonflow.db.api_nb [-] Pushing Update to Queue: Action:update, Table:ovsinterface, Key:61176198-5e89-4bcf-a671-17f6ce0d5397 Value:uuid:61176198-5e89-4bcf-a671-17f6ce0d5397, ofport:14, name:tap86f8d260-37, admin_state:down, type:vm, iface_id:86f8d260-375e-4549-8f81-ad4c9c1fd2a2, peer:, attached_mac:fa:16:3e:f0:c8:ac, remote_ip:, tunnel_type: Topic:None
2016-04-08 14:18:31.508 INFO dragonflow.controller.ryu_base_app [-] port added 14
2016-04-08 14:18:31.509 INFO dragonflow.controller.ryu_base_app [-] port modified 14
2016-04-08 14:18:31.510 INFO dragonflow.controller.topology [-] Ovs port updated: uuid:61176198-5e89-4bcf-a671-17f6ce0d5397, ofport:-1, name:tap86f8d260-37, admin_state:, type:vm, iface_id:86f8d260-375e-4549-8f81-ad4c9c1fd2a2, peer:, attached_mac:fa:16:3e:f0:c8:ac, remote_ip:, tunnel_type:
2016-04-08 14:18:31.515 INFO dragonflow.db.api_nb [-] Pushing Update to Queue: Action:update, Table:ovsinterface, Key:61176198-5e89-4bcf-a671-17f6ce0d5397 Value:uuid:61176198-5e89-4bcf-a671-17f6ce0d5397, ofport:14, name:tap86f8d260-37, admin_state:up, type:vm, iface_id:86f8d260-375e-4549-8f81-ad4c9c1fd2a2, peer:, attached_mac:fa:16:3e:f0:c8:ac, remote_ip:, tunnel_type: Topic:None

When disable it (by reverting the commit), the logged message is

2016-04-08 14:05:41.578 INFO dragonflow.db.api_nb [-] Pushing Update to Queue: Action:create, Table:ovsinterface, Key:535f4785-dffc-4417-a4d9-4561c6899b07 Value:uuid:535f4785-dffc-4417-a4d9-4561c6899b07, ofport:-1, name:tap02501dca-17, admin_state:, type:vm, iface_id:02501dca-171b-4332-9136-91ea45a9e6f4, peer:, attached_mac:fa:16:3e:4a:58:68, remote_ip:, tunnel_type: Topic:D
2016-04-08 14:05:41.586 INFO dragonflow.db.api_nb [-] Pushing Update to Queue: Action:update, Table:ovsinterface, Key:535f4785-dffc-4417-a4d9-4561c6899b07 Value:uuid:535f4785-dffc-4417-a4d9-4561c6899b07, ofport:13, name:tap02501dca-17, admin_state:down, type:vm, iface_id:02501dca-171b-4332-9136-91ea45a9e6f4, peer:, attached_mac:fa:16:3e:4a:58:68, remote_ip:, tunnel_type: Topic:D
2016-04-08 14:05:41.588 INFO dragonflow.controller.ryu_base_app [-] port added 13
2016-04-08 14:05:41.592 INFO dragonflow.controller.dhcp_app [-] Regiter VM as DHCP client::port <02501dca-171b-4332-9136-91ea45a9e6f4>
2016-04-08 14:05:41.593 INFO dragonflow.controller.ryu_base_app [-] port modified 13
2016-04-08 14:05:41.594 INFO dragonflow.controller.topology [-] Ovs port updated: uuid:535f4785-dffc-4417-a4d9-4561c6899b07, ofport:-1, name:tap02501dca-17, admin_state:, type:vm, iface_id:02501dca-171b-4332-9136-91ea45a9e6f4, peer:, attached_mac:fa:16:3e:4a:58:68, remote_ip:, tunnel_type:
2016-04-08 14:05:41.604 INFO dragonflow.db.api_nb [-] Pushing Update to Queue: Action:update, Table:ovsinterface, Key:535f4785-dffc-4417-a4d9-4561c6899b07 Value:uuid:535f4785-dffc-4417-a4d9-4561c6899b07, ofport:13, name:tap02501dca-17, admin_state:up, type:vm, iface_id:02501dca-171b-4332-9136-91ea45a9e6f4, peer:, attached_mac:fa:16:3e:4a:58:68, remote_ip:, tunnel_type: Topic:D
2016-04-08 14:06:04.116 INFO dragonflow.controller.dhcp_app [-] sending DHCP offer for port IP 10.0.4.3 port id 02501dca-171b-4332-9136-91ea45a9e6f4
2016-04-08 14:06:04.132 INFO dragonflow.controller.dhcp_app [-] sending DHCP ACK for port IP 10.0.4.3 port id 02501dca-171b-4332-9136-91ea45a9e6f4