Reviewed: https://review.opendev.org/c/openstack/neutron/+/944387
Committed:
https://opendev.org/openstack/neutron/commit/d52c22bbac140170aad60b231d648102767cb2f4
Submitter: "Zuul (22348)"
Branch: master
commit d52c22bbac140170aad60b231d648102767cb2f4
Author: Rodolfo Alonso Hernandez <ralon...@redhat.com>
Date: Fri Mar 14 04:40:53 2025 +0000
[OVN] Do not delete twice the agent from the cache
When a delete agent command is issued, the API worker that attends
the API call, it issues an OVN SB ``SB_Global`` event to inform any
other worker about the deletion of the agent, thus they can delete
the agent from their local OVN agent cache.
The problem is that this event is also received by the worker that
is sending it. Because the call that is generating the event is also
deleting the agent [1], this worker tries to delete the agent twice;
the second time, it generates a KeyError exception in the local OVN
agent cache.
The code added in [1] should be deleted.
[1]https://review.opendev.org/c/openstack/neutron/+/883607/3/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py#1421
Closes-Bug: #2102645
Change-Id: Ie391af5a3b226cbd33f7162a3c970d636fcdf1da
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2102645
Title:
[OVN] OVN agent deletion raises an error in the agent cache
Status in neutron:
Fix Released
Bug description:
When an OVN agent is deleted, the following exception is raised:
"""
ERROR neutron_lib.callbacks.manager Traceback (most recent call last):
ERROR neutron_lib.callbacks.manager File
"/opt/stack/neutron-lib/neutron_lib/callbacks/manager.py", line 189, in
_notify_loop
ERROR neutron_lib.callbacks.manager callback.method(resource, event,
trigger, payload=payload)
ERROR neutron_lib.callbacks.manager File
"/opt/stack/neutron/neutron/db/agentschedulers_db.py", line 494, in
auto_schedule_new_network_segments
ERROR neutron_lib.callbacks.manager segments =
segment_plugin.get_segments(
ERROR neutron_lib.callbacks.manager AttributeError: 'NoneType' object has no
attribute 'get_segments'
ERROR neutron_lib.callbacks.manager
"""
The problem is that the worker that receives the command to delete the
agent is deleting the agent cache entry in this call, in
``OVNMechanismDriver.delete_agent``. This method is also generating an
OVN SB event writing in the ``SB_Global`` SB table to inform to other
agents about this deletion. When this event is received, each worker
updates its own local agent cache correspondingly.
The problem is that the same worker that is issuing this event is also
receiving it, and thus the worker tries to delete the agent cache
twice. That was added in [1] but is not needed.
NOTE: backport the fix up to 2023.2 (same as [1]).
[1]https://review.opendev.org/c/openstack/neutron/+/883607/3/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py#1421
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