Hello everybody, after restart of one of the control nodes i see this error message every few seconds int the logs: @timestamp July 23rd 2019, 16:44:08.927 t Hostname ctlX t Logger openstack.nova t Payload Failed to process message ... skipping it.: DuplicateMessageError: Found duplicate message(f2178cffb5d249f3a1d2df1c0322f18c). Skipping it. 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit Traceback (most recent call last): 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py", line 361, in _callback 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit self.callback(RabbitMessage(message)) 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 251, in __call__ 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit unique_id = self.msg_id_cache.check_duplicate_message(message) 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/oslo_messaging/_drivers/amqp.py", line 122, in check_duplicate_message 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit raise rpc_common.DuplicateMessageError(msg_id=msg_id) 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit DuplicateMessageError: Found duplicate message(f2178cffb5d249f3a1d2df1c0322f18c). Skipping it. 2019-07-23 16:44:08.927 82 ERROR oslo.messaging._drivers.impl_rabbit t Pid 82 t Timestamp 2019-07-23 16:44:08.927 t _id AWwfSjEtsndUu9YeotwF t _index flog-2019.07.23 # _score - t _type fluentd t log_level ERROR t programname nova-scheduler t python_module oslo.messaging._drivers.impl_rabbit As soon as the restarted node is taken out of the cluster, the errors disappear. Any idea how to fix this? Thank you Pawel