From the logs #20, I could see query for /analytics/uves/virtual-machine-interface/default-domain:*:*?flat only in openc52. The query was made @ 2017-09-15 12:58:18, 2017-09-15 13:14:25 and 2017-09-15 13:30:51 During this period, I analytics-api was not not able to connect to the redis @ 172.23.10.194 The following Exception was continuously logged in the contrail-analytics-api.log 09/15/2017 01:14:18 PM [contrail-analytics-api]: Exception ConnectionError in uve cache proc. Arguments: (u'Error 99 connecting 172.23.10.194:6379. Cannot assign requested address.',) : traceback Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/opserver/partition_handler.py", line 191, in get_cache_uve tfilter, ackfilter, False) File "/usr/lib/python2.7/dist-packages/opserver/partition_handler.py", line 126, in _get_uve_content pperes = ppe.execute() File "/usr/lib/python2.7/dist-packages/redis/client.py", line 2000, in execute return execute(conn, stack, raise_on_error) File "/usr/lib/python2.7/dist-packages/redis/client.py", line 1869, in _execute_transaction connection.send_packed_command(all_cmds) File "/usr/lib/python2.7/dist-packages/redis/connection.py", line 292, in send_packed_command self.connect() File "/usr/lib/python2.7/dist-packages/redis/connection.py", line 235, in connect raise ConnectionError(self._error_message(e)) ConnectionError: Error 99 connecting 172.23.10.194:6379. Cannot assign requested address. So, either there was some connectivity issue to 172.23.10.194 or redis server couldn't accept new connections due to max client connections reached. I had seen the latter case when haproxy continuously connects to redis. Can you please check if the following line is present in haproxy config? If so, please remove this line and restart haproxy and redis service - https://bugs.launchpad.net/juniperopenstack/+bug/1648601 tcp-check connect port 6379 openc52-contrail-analytics-api logs: ----------------------------------- bash-3.2$ grep -r "virtual-machine-interface" * log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.197 - - [2017-09-15 12:58:18] "GET /analytics/uves/virtual-machine-interface/default-domain:*:*?flat HTTP/1.1" 200 36103651 69.184298 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 13:14:25] "GET /analytics/uves/virtual-machine-interface/default-domain:*:*?flat HTTP/1.1" 200 35523881 72.361021 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.194 - - [2017-09-15 13:30:51] "GET /analytics/uves/virtual-machine-interface/default-domain:*:*?flat HTTP/1.1" 200 35710910 72.576068 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:57:09] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-011-pr-0949:commonmax-011-vmi-0949001005B-3?flat HTTP/1.1" 200 646 0.002621 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:57:26] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-001-pr-0093:commonmax-001-vmi-0093002003B-6?flat HTTP/1.1" 200 642 0.002275 log/contrail/contrail-analytics-api-stdout.log.7:172.23.10.205 - - [2017-09-15 09:31:36] "GET /virtual-machine-interfaces HTTP/1.1" 404 163 0.000527 openc15-contrail-analytics-api logs: ----------------------------------- bash-3.2$ grep -r "virtual-machine-interface" * log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 11:21:34] "GET /analytics/uves/virtual-machine-interfaces HTTP/1.1" 200 13762421 6.256814 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.194 - - [2017-09-15 11:25:44] "GET /analytics/uves/virtual-machine-interfaces HTTP/1.1" 200 13762421 5.524747 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.197 - - [2017-09-15 11:30:18] "GET /analytics/uves/virtual-machine-interfaces HTTP/1.1" 200 13703344 6.340615 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:38:58] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-011-pr-0949:commonmax-011-vmi-0949001005B-3?flat HTTP/1.1" 200 646 0.004041 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.197 - - [2017-09-15 16:43:07] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-007-pr-0093:commonmax-007-vmi-0093010003B-3?flat HTTP/1.1" 200 643 0.003218 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:57:16] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-007-pr-0093:commonmax-007-vmi-0093010003B-3?flat HTTP/1.1" 200 643 0.003299 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:57:29] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-010-pr-0246:commonmax-010-vmi-0246001004B-f?flat HTTP/1.1" 200 646 0.003203 openc51-contrail-analytics-api logs: ----------------------------------- bash-3.2$ grep -r "virtual-machine-interface" * log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.205 - - [2017-09-15 09:30:49] "GET /virtual-machine-interfaces HTTP/1.1" 404 163 0.001093 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 10:14:42] "GET /analytics/uves/virtual-machine-interfaces HTTP/1.1" 200 13762421 3.560376 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.194 - - [2017-09-15 10:19:30] "GET /analytics/uves/virtual-machine-interfaces HTTP/1.1" 200 13762421 3.829684 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.197 - - [2017-09-15 10:25:14] "GET /analytics/uves/virtual-machine-interfaces HTTP/1.1" 200 13703344 68.426998 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:39:04] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-011-pr-0949:commonmax-011-vmi-0949001005B-3?flat HTTP/1.1" 200 646 0.002773 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.197 - - [2017-09-15 16:43:56] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-007-pr-0093:commonmax-007-vmi-0093010003B-3?flat HTTP/1.1" 200 643 0.002697 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:57:22] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-007-pr-0093:commonmax-007-vmi-0093010003B-3?flat HTTP/1.1" 200 643 0.002605 log/contrail/contrail-analytics-api-stdout.log.6:172.23.10.193 - - [2017-09-15 16:57:33] "GET /analytics/uves/virtual-machine-interface/default-domain:commonmax-011-pr-0414:commonmax-011-vmi-0414001003A-e?flat HTTP/1.1" 200 646 0.002835