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[Hong Hui Xiao <xiaohhui@xxxxxxxxxx>]

Public bug reported:

I noticed this error message in neutron-ovs-agent log when start
neutron-openvswitch-agent

ERROR neutron.agent.linux.ovsdb_monitor [req-a7c7a398-a13b-490e-
adf8-c5afb24b4b9c None None] Interface monitor is not active.

ovs-agent will start ovsdb_monitor at [1], and first use it at [2].
There is no guarantee that ovsdb_monitor is ready at [2]. So, I can see
the error when start neutron-openvswitch-agent.

We should block the start to wait for the process to be active, and then
use it. Or else, the use of ovsdb_monitor will be meaningless.


[1]
https://github.com/openstack/neutron/blob/6da27a78f42db00c91a747861eafde7edc6f1fa7/neutron/agent/linux/polling.py#L35

[2]
https://github.com/openstack/neutron/blob/6da27a78f42db00c91a747861eafde7edc6f1fa7/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1994

** Affects: neutron
     Importance: Undecided
     Assignee: Hong Hui Xiao (xiaohhui)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Hong Hui Xiao (xiaohhui)

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https://bugs.launchpad.net/bugs/1584647

Title:
  "Interface monitor is not active" can be observed at ovs-agent start

Status in neutron:
  New

Bug description:
  I noticed this error message in neutron-ovs-agent log when start
  neutron-openvswitch-agent

  ERROR neutron.agent.linux.ovsdb_monitor [req-a7c7a398-a13b-490e-
  adf8-c5afb24b4b9c None None] Interface monitor is not active.

  ovs-agent will start ovsdb_monitor at [1], and first use it at [2].
  There is no guarantee that ovsdb_monitor is ready at [2]. So, I can
  see the error when start neutron-openvswitch-agent.

  We should block the start to wait for the process to be active, and
  then use it. Or else, the use of ovsdb_monitor will be meaningless.


  [1]
  https://github.com/openstack/neutron/blob/6da27a78f42db00c91a747861eafde7edc6f1fa7/neutron/agent/linux/polling.py#L35

  [2]
  https://github.com/openstack/neutron/blob/6da27a78f42db00c91a747861eafde7edc6f1fa7/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1994

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