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Reviewed:  https://review.openstack.org/319788
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=95ff46722d195eb894e79b08c5a6eb13082cc799
Submitter: Jenkins
Branch:    master

commit 95ff46722d195eb894e79b08c5a6eb13082cc799
Author: Hong Hui Xiao <xiaohhui@xxxxxxxxxx>
Date:   Mon May 23 08:33:55 2016 +0000

    Wait for ovsdb_monitor to be active before use it
    
    There is a race between ovsdb_monitor becoming active and using
    ovsdb_monitor. Sometimes, code [1] will be hit at ovs-agent startup.
    
    The fix here will block the start of ovsdb_monitor, so that the
    following code to use the ovsdb_monitor will have ovsdb_monitor be
    active.
    
    [1] https://goo.gl/RJX4I5
    Closes-bug: #1584647
    
    Change-Id: I893a3b250339006f50aa003686fb95d7f2465edc


** Changed in: neutron
       Status: In Progress => Fix Released

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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:
  Fix Released

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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