我的环境 openstack 在 rabbitmq 上进行通信，只有一个rabbitmq节点，而不是群集;
我发现一个计算节点无法正常工作， nova-compute服务无法从nova-conductor服务中获取rpc请求。
与此同时，nova-conductor日志中有许多类似下面的日志。
有人知道吗？
2016-06-07 14:37:54.184 13820 INFO oslo_messaging._drivers.impl_rabbit [req-83bfbe28-3729-4756-8dc3-fc1d8a05d71f - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.186 13820 INFO oslo_messaging._drivers.impl_rabbit [req-a9b99ca4-4dc2-4bb9-b003-279a7fab9aa4 - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.214 13820 INFO oslo_messaging._drivers.impl_rabbit [req-c7d6e857-f73e-45c3-9f1e-d92760822a2a - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.224 13822 INFO oslo_messaging._drivers.impl_rabbit [req-7be21851-d331-47f7-a0fc-8225a65ba68f - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.225 13822 INFO oslo_messaging._drivers.impl_rabbit [req-b14f1618-1fe7-4804-bb4d-25e87d9f764a - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.263 13824 INFO oslo_messaging._drivers.impl_rabbit [req-72e2a5fe-21b5-4221-bc00-3990e8f8d10e - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.263 13824 INFO oslo_messaging._drivers.impl_rabbit [req-b97dfd77-0955-4919-a4f1-469c73a6eb34 - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.269 13824 INFO oslo_messaging._drivers.impl_rabbit [req-ebb588bf-85ca-43ef-95d6-f755a28bb5be - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.281 13823 INFO oslo_messaging._drivers.impl_rabbit [req-b14f1618-1fe7-4804-bb4d-25e87d9f764a - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.313 13823 INFO oslo_messaging._drivers.impl_rabbit [req-3b5b4e32-dc3e-457d-9e48-ae545e4b34a7 - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...
2016-06-07 14:37:54.342 13820 INFO oslo_messaging._drivers.impl_rabbit [req-6692ac00-97a1-4ef4-9b05-8b271c6a2009 - - - - -] The exchange to reply to reply_9270c332921a4fadb6b370fec2ecce16 doesn't exist yet, retrying...