Totally agreed with you, I had similar issue when my cluster got split and not able to recover from that state then finally i have to re-build it from scratch to make it functional. There isn't any good guideline about rabbitmq capacity planning, every deployment is unique. Anyway thanks for those script i will hook them up with my monitoring system. On Wed, Mar 11, 2020 at 9:05 PM Erik Olof Gunnar Andersson <eandersson@blizzard.com> wrote:
We are hitting something awfully similar.
We have basically been hitting a few pretty serious bugs with RabbitMQ.
The main one is when a RabbitMQ server crashes, or gets split brain it does not always recover, or even when just one node is restarted. We sometimes end up with orphaned consumers that keep consuming messages, but goes to /dev/null pretty much. Another issue is that sometimes bindings stop working. They are visually there, but simply does not route traffic to the intended queues.
e.g. https://github.com/rabbitmq/rabbitmq-server/issues/641
I wrote two quick scripts to audit these issues. http://paste.openstack.org/show/790569/ - Check if you have orphaned consumers (may need pagination if you have a large deployment). http://paste.openstack.org/show/790570/ - Check if the bindings are bad for a specific queue.
The main issue seems to be the number of queues + connections causing the recovery after restarting a node to cause bindings and/or queues to get into an "orphaned" state.
Best Regards, Erik Olof Gunnar Andersson
-----Original Message----- From: Satish Patel <satish.txt@gmail.com> Sent: Wednesday, March 11, 2020 5:14 PM To: Grant Morley <grant@civo.com> Cc: openstack-discuss@lists.openstack.org Subject: Re: Neutron RabbitMQ issues
I am also dealing with some short of rabbitmq performance issue but its not as worst you your issue.
This is my favorite video, not sure you have seen this before or not but anyway posting here - https://urldefense.com/v3/__https://www.youtube.com/watch?v=bpmgxrPOrZw__;!!...
On Wed, Mar 11, 2020 at 10:24 AM Grant Morley <grant@civo.com> wrote:
Hi all,
We are currently experiencing some fairly major issues with our OpenStack cluster. It all appears to be with Neutron and RabbitMQ. We are seeing a lot of time out messages in responses to replies and because of this instance creation or anything to do with instances and networking is broken.
We are running OpenStack Queens.
We have already tuned Rabbit for Neutron by doing the following on neutron:
heartbeat_timeout_threshold = 0 rpc_conn_pool_size = 300 rpc_thread_pool_size = 2048 rpc_response_timeout = 3600 rpc_poll_timeout = 60
## Rpc all executor_thread_pool_size = 64 rpc_response_timeout = 3600
What we are seeing in the error logs for neutron for all services (l3-agent, dhcp, linux-bridge etc ) are these timeouts:
https://urldefense.com/v3/__https://pastebin.com/Fjh23A5a__;!!Ci6f514n 9QsL8ck!1rOR_L7ya6zmMgZ0owpfO7NvhsPOzbgyUplonob2awcg8hd80yCAT_ynvapLQK 9aOA$
We have manually tried to get everything in sync by forcing fail-over of the networking which seems to get routers in sync.
We are also seeing that there are a lot of "unacknowledged" messages in RabbitMQ for 'q-plugin' in the neutron queues.
Some times restarting of the services on neutron gets these back acknowledged again, however the timeouts come back.
The RabbitMQ servers themselves are not loaded at all. All memory, file descriptors and errlang processes have plenty of resources available.
We are also seeing a lot of rpc issues:
Timeout in RPC method release_dhcp_port. Waiting for 1523 seconds before next attempt. If the server is not down, consider increasing the rpc_response_timeout option as Neutron server(s) may be overloaded and unable to respond quickly enough.: MessagingTimeout: Timed out waiting for a reply to message ID 965fa44ab4f6462fa378a1cf7259aad4 2020-03-10 19:02:33.548 16242 ERROR neutron.common.rpc [req-a858afbb-5083-4e21-a309-6ee53582c4d9 - - - - -] Timeout in RPC method release_dhcp_port. Waiting for 3347 seconds before next attempt. If the server is not down, consider increasing the rpc_response_timeout option as Neutron server(s) may be overloaded and unable to respond quickly enough.: MessagingTimeout: Timed out waiting for a reply to message ID 7937465f15634fbfa443fe1758a12a9c
Does anyone know if there is anymore tuning to be done at all? Upgrading for us at the moment to a newer version isn't really an option unfortunately.
Because of our setup, we also have roughly 800 routers enabled and I know that will be putting a load on the system. However these problems have only started to happen roughly 1 week ago and have steadily got worse.
If anyone has any use cases for this or any more recommendations that would be great.
Many thanks,