[Bug 1914437] Re: [SRU] MessageTimeout and DuplicateMessage errors after udpate

[Chris MacNaughton]

I'm marking this as not affecting Queens because the change that caused
this regression didn't get out of queens-proposed.

** No longer affects: cloud-archive/queens

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https://bugs.launchpad.net/bugs/1914437

Title:
  [SRU] MessageTimeout and DuplicateMessage errors after udpate

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive rocky series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Triaged
Status in oslo.messaging:
  New
Status in python-oslo.messaging package in Ubuntu:
  Invalid
Status in python-oslo.messaging source package in Bionic:
  Triaged

Bug description:
  A recent update to oslo.messaging to resolve #1789177 causes failures.

  (Below comments copied form the original bug):

  After a partial upgrade (only one side, producers or consumers), there
  are a lot of MessageTimeout and DuplicateMessage errors in the logs.
  Downgrading back to 5.35.0-0ubuntu1~cloud0 fixed the problem.

  Right after restarted n-ovs-agent, I can see a lot of errors in rabbitmq log[1]
  which is the same as the error when rabbitmq failover issue ( the original issue of this LP )

  Then after I upgraded oslo.messaging in neutron-api unit and restarted
  neutron-server, below errors are gone and I was able to create
  instance again.

  After upgrading oslo.messaging in n-ovs only, exchange they communicate didn't match.
  As changing exchanges they use depends on publisher-cosumer relation.

  So I think there are two ways.
  1. revert this patch for Q ( original failover problem will be there )
  2. upgrade them with maintenance window

  Thanks a lot

  [1]
  ################################################################################
  =ERROR REPORT==== 3-Feb-2021::03:25:26 ===
  Channel error on connection <0.2379.1> (10.0.0.32:60430 -> 10.0.0.34:5672, vhost: 'openstack', user: 'neutron'), channel 1:
  {amqp_error,not_found,
              "no exchange 'reply_7da3cecc31b34bdeb96c866dc84e3044' in vhost 'openstack'",
              'basic.publish'}

  10.0.0.32 is neutron-api unit

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