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This is what I did, I am not very expert in rabbitMQ debugging where I can trace back message via ID or something. If there is a any good way then let me know I will give it a try. 

Finally I did following to recover after 24 hour. Shutdown all nova service first, api, conductor, scheduler etc. then I wipe out my rabbitMQ completely including mnesia and then rebuild cluster and then start nova service one by one. 

After that I didn’t see any issue in all my compute nodes. No error and nothing and they came back clean. 

Im trying to reproduce same incident in lab to see if I can get that condition. I don’t know what is the relationship here so I have to stop all nova service in order to rebuild rabbitMQ. We have 200 compute nodes in this cluster do you think that could be the issue because they are constantly trying to talk to rabbit and it was down?

I have one more openstack deployment running on queens and it’s 250 node cloud and I rebuild rabbitMQ million times but never ever had issue like I had with wallaby. 



Sent from my iPhone

> On Feb 11, 2022, at 9:11 AM, Eugen Block <eblock at nde.ag> wrote:
> 
> So 'rabbitmqctl cluster_status' show the expected output? Can you trace back the request ID (req-6c3cdaa3-ecf9-4bef-9def-6b6a69dfd30b) and see if it was completed? Usually I see nova recovering after a rabbit outage, this would be unexpected. One more thing, you wrote you're seeing these messages today but you pasted messages from yesterday. Is nova still logging those messages?
> 
> Zitat von Satish Patel <satish.txt at gmail.com>:
> 
>> RabbitMQ logs are very clean and all info logging. It’s feel like something is broken between conductor and nova-compute. Compute is saying waiting for message ID.
>> 
>> May be I rebuild rabbit during that time nova-conductor was keep trying to connect or doing something and when rabbit back then some message stuck in queue half way. I don’t know the flow so just making up some theory.
>> 
>> All computes showing same logs but waiting for different message ID. Is nova-compute talk to conductor and wait for ack reply or not?
>> 
>> Sent from my iPhone
>> 
>>>> On Feb 11, 2022, at 5:39 AM, Eugen Block <eblock at nde.ag> wrote:
>>> 
>>> What do the rabbit logs reveal?
>>> 
>>> 
>>> Zitat von Satish Patel <satish.txt at gmail.com>:
>>> 
>>>> Folks,
>>>> 
>>>> I am running wallaby and Today i had rabbitMQ issue and i rebuild
>>>> RabbitMQ. but now my all compute node throwing following error. not
>>>> sure what is going on up they are not trying to come up and keep
>>>> crashing with following error
>>>> 
>>>> 
>>>> 2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> [req-6c3cdaa3-ecf9-4bef-9def-6b6a69dfd30b - - - - -] Error starting
>>>> thread.: oslo_messaging.exceptions.MessagingTimeout: Timed out waiting
>>>> for a reply to message ID 9510bd6c0d6a48e782ed7bc2887f32c8
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> Traceback (most recent call last):
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/_drivers/amqpdriver.py",
>>>> line 433, in get
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return self._queues[msg_id].get(block=True, timeout=timeout)
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/eventlet/queue.py",
>>>> line 322, in get
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return waiter.wait()
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/eventlet/queue.py",
>>>> line 141, in wait
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return get_hub().switch()
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/eventlet/hubs/hub.py",
>>>> line 313, in switch
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return self.greenlet.switch()
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> _queue.Empty
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service During
>>>> handling of the above exception, another exception occurred:
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> Traceback (most recent call last):
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_service/service.py",
>>>> line 807, in run_service
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> service.start()
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/nova/service.py",
>>>> line 159, in start
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> self.manager.init_host()
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/nova/compute/manager.py",
>>>> line 1413, in init_host
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> self.driver.init_host(host=self.host)
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/nova/virt/libvirt/driver.py",
>>>> line 792, in init_host
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> self._register_instance_machine_type()
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/nova/virt/libvirt/driver.py",
>>>> line 811, in _register_instance_machine_type
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service     for
>>>> instance in objects.InstanceList.get_by_host(context, hostname):
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_versionedobjects/base.py",
>>>> line 175, in wrapper
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> result = cls.indirection_api.object_class_action_versions(
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/nova/conductor/rpcapi.py",
>>>> line 240, in object_class_action_versions
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return cctxt.call(context, 'object_class_action_versions',
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/rpc/client.py",
>>>> line 175, in call
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> self.transport._send(self.target, msg_ctxt, msg,
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/transport.py",
>>>> line 123, in _send
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return self._driver.send(target, ctxt, message,
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/_drivers/amqpdriver.py",
>>>> line 680, in send
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> return self._send(target, ctxt, message, wait_for_reply, timeout,
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/_drivers/amqpdriver.py",
>>>> line 669, in _send
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> result = self._waiter.wait(msg_id, timeout,
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/_drivers/amqpdriver.py",
>>>> line 559, in wait
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> message = self.waiters.get(msg_id, timeout=timeout)
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service   File
>>>> "/openstack/venvs/nova-23.1.1/lib/python3.8/site-packages/oslo_messaging/_drivers/amqpdriver.py",
>>>> line 435, in get
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> raise oslo_messaging.MessagingTimeout(
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>>> oslo_messaging.exceptions.MessagingTimeout: Timed out waiting for a
>>>> reply to message ID 9510bd6c0d6a48e782ed7bc2887f32c8
>>>> 
>>>>  2022-02-10 00:52:27.843 3660531 ERROR oslo_service.service
>>> 
>>> 
>>> 
>>> 
> 
> 
>