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[Thomas Morin <1630920@xxxxxxxxxxxxxxxxxx>]

** Also affects: bgpvpn
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1630920

Title:
  native/idl ovsdb driver loses some ovsdb transactions

Status in networking-bgpvpn:
  New
Status in neutron:
  In Progress

Bug description:
  It seems the 'native' and the 'vsctl' ovsdb drivers behave
  differently. The native/idl driver seems to lose some ovsdb
  transactions, at least the transactions setting the 'other_config' ovs
  port attribute.

  I have written about this in a comment of an earlier bug report
  (https://bugs.launchpad.net/neutron/+bug/1626010). But I opened this
  new bug report because the two problems seem to be independent and
  that other comment may have gone unnoticed.

  It is not completely clear to me what difference this causes in user-
  observable behavior. I think it at least leads to losing information
  about which conntrack zone to use in the openvswitch firewall driver.
  See here:

  https://github.com/openstack/neutron/blob/3ade301/neutron/agent/linux/openvswitch_firewall/firewall.py#L257

  The details:

  If I use the vsctl ovsdb driver:

  ml2_conf.ini:
  [ovs]
  ovsdb_interface = vsctl

  then I see this:

  $ > /opt/stack/logs/q-agt.log
  $ sudo ovs-vsctl list Port | grep other_config | grep -c net_uuid
  1
  $ openstack server create --flavor cirros256 --image cirros-0.3.4-x86_64-uec --nic net-id=net0 --wait vm0
  $ sudo ovs-vsctl list Port | grep other_config | grep -c net_uuid
  2
  $ openstack server delete vm0
  $ sleep 3
  $ sudo ovs-vsctl list Port | grep other_config | grep -c net_uuid
  1
  $ egrep -c 'Transaction caused no change' /opt/stack/logs/q-agt.log 
  0

  But if I use the (default) native driver:

  ml2_conf.ini:
  [ovs]
  ovsdb_interface = native

  Then this happens:

  $ > /opt/stack/logs/q-agt.log
  $ sudo ovs-vsctl list Port | grep other_config | grep -c net_uuid
  1
  $ openstack server create --flavor cirros256 --image cirros-0.3.4-x86_64-uec --nic net-id=net0 --wait vm0
  $ sudo ovs-vsctl list Port | grep other_config | grep -c net_uuid
  1
  $ openstack server delete vm0
  $ sleep 3
  $ sudo ovs-vsctl list Port | grep other_config | grep -c net_uuid
  1
  $ egrep -c 'Transaction caused no change' /opt/stack/logs/q-agt.log
  22

  A sample log message from q-agt.log:

  2016-10-06 09:23:05.447 DEBUG neutron.agent.ovsdb.impl_idl [-] Running txn command(idx=0): DbSetCommand(table=Port, col_values=(('other_config', {'tag': 1}),), record=tap8e2a390d-63) from (pid=6068) do_commit /opt/stack/neutron/neutron/agent/ovsdb/impl_idl.py:99
  2016-10-06 09:23:05.448 DEBUG neutron.agent.ovsdb.impl_idl [-] Transaction caused no change from (pid=6068) do_commit /opt/stack/neutron/neutron/agent/ovsdb/impl_idl.py:126

  devstack version: 563d377
  neutron version: 3ade301

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