[Bug 1899369] Re: ovn-controller: Disable ofctrl probe by default

[Frode Nordahl]

The fix is in 20.09 and has already been backported upstream to 20.06
and 20.03:

branch-20.03: https://github.com/ovn-org/ovn/commit/028d6db38ff56018ba40b3abb3da94ba7a724ffa
branch-20.06: https://github.com/ovn-org/ovn/commit/8cd56feadbc8644ece036784f78dd9be289c9fe9


** Changed in: ovn (Ubuntu)
       Status: New => Triaged

** Changed in: ovn (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1899369

Title:
  ovn-controller: Disable ofctrl probe by default

Status in ovn package in Ubuntu:
  Triaged

Bug description:
  A change [0] prior to the release of OVN v20.03.0 introduced a change
  of behavior where the inactivity probe for the ofctrl connection
  defaults to 5 seconds. Since this normally is a unix socket the
  default was not to have a inactivity probe at all.

  On a busy system a inactivity probe of 5 seconds is not enough for the
  OVN Controller to complete programming of the switch.

  The change of behavior was corrected in [1] and I think it would be
  beneficial if Ubuntu backported this fix to the OVN package rather
  than having charms and/or end users work around the issue by manually
  configuring the timeout through the `external-ids:ovn-openflow-probe-
  interval` key in the Open_vSwitch table.

  Symptoms of this problem is that a OVN controller is either unable to
  do initial programming of a switch for a host with many ports and
  flows or that updates are lost on a functional system. The following
  will be printed in the log:

  2020-10-11T18:56:09.355Z|30186|rconn|ERR|unix:/var/run/openvswitch/br-
  int.mgmt: no response to inactivity probe after 5 seconds,
  disconnecting

  0: https://github.com/ovn-org/ovn/commit/c99069c8934c9ea55d310a8b6d48fb66aa477589
  1: https://github.com/ovn-org/ovn/commit/b8af8549396e62d6523be18e104352e334825783

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