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[Brian Haley <1825152@xxxxxxxxxxxxxxxxxx>]

Closing as no one has picked it up. Please re-open if anyone intends to
work on it. Thanks.

** Changed in: neutron
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1825152

Title:
  [scale issue] the root rootwrap deamon causes l3 agent router
  procssing very very slow

Status in neutron:
  Won't Fix

Bug description:
  [scale issue] the root rootwrap deamon causes l3 agent router
  procssing very very slow

  ENV: stable/queens

  
  When l3 agent has a large number of scheduled routers, during the agent restart time, l3-agent will re-sync all router info, and processing them again. Routers will be processed concurrently in the green thread pool.
  But, we noticed that it taks really long time for all the router to finish the processing. For 50 router, it could be 30 mins or more.

  By comparison, if we set the `use_helper_for_ns_read=False` and
  `root_helper_daemon=''`, the total processing time reduced.

  The following are the LOG comparison. The critical log message is
  "Starting router update for" and "Finished a router update".

  
  Before change the config:

  2019-04-17 14:51:56.418 2702 INFO neutron.agent.l3.agent [-] Starting router update for 4e7af6a8-830d-4647-8dfc-3b9b825a3c37, action None, priority 0
  2019-04-17 14:51:56.419 2702 INFO neutron.agent.l3.agent [-] Starting router update for 834be7ac-a2ac-4125-8fda-1a54c3e9e12a, action None, priority 0
  2019-04-17 14:51:56.427 2702 INFO neutron.agent.l3.agent [-] Starting router update for e40915aa-5d5a-4b39-a823-d935b91e3255, action None, priority 0
  2019-04-17 14:51:56.435 2702 INFO neutron.agent.l3.agent [-] Starting router update for 9d1207e3-b8e9-4959-9d03-bded785c76bd, action None, priority 0
  2019-04-17 14:51:56.442 2702 INFO neutron.agent.l3.agent [-] Starting router update for 4247f759-827c-476b-90e9-29f725158daf, action None, priority 0
  2019-04-17 14:51:56.449 2702 INFO neutron.agent.l3.agent [-] Starting router update for c74132d7-4490-45d2-bedb-c7b09f19460f, action None, priority 0
  2019-04-17 14:51:56.457 2702 INFO neutron.agent.l3.agent [-] Starting router update for 03a87c31-d25f-4260-8b43-408b6f963459, action None, priority 0
  2019-04-17 14:51:56.464 2702 INFO neutron.agent.l3.agent [-] Starting router update for b6c8d929-b0aa-4d35-86dd-34a7a62c89fa, action None, priority 0
  2019-04-17 14:52:39.798 2702 INFO neutron.agent.l3.agent [-] Starting router update for 02f9e40f-715e-48f3-966a-e2f8038dc41c, action None, priority 0
  2019-04-17 14:54:02.965 2702 INFO neutron.agent.l3.agent [-] Starting router update for 3a9dbd08-bd30-4e7f-95c3-dda0b1b8fadc, action None, priority 0
  2019-04-17 14:54:02.966 2702 INFO neutron.agent.l3.agent [-] Starting router update for 36c9cc1c-bef2-4970-adb5-a3c42ac1a434, action None, priority 0
  2019-04-17 14:54:06.014 2702 INFO neutron.agent.l3.agent [-] Starting router update for 3936e670-4c26-41d0-b216-0566a832bc64, action None, priority 0

  2019-04-17 14:52:39.798 2702 INFO neutron.agent.l3.agent [None req-3b510ecb-c216-4b16-9135-a43b64424469 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for 03a87c31-d25f-4260-8b43-408b6f963459
  2019-04-17 14:54:02.965 2702 INFO neutron.agent.l3.agent [None req-2e15f903-d609-46a0-9276-f7ab3bba46e4 - ac0e1aa4871d45618e7df05b5c2a5845 - - -] Finished a router update for c74132d7-4490-45d2-bedb-c7b09f19460f
  2019-04-17 14:54:06.014 2702 INFO neutron.agent.l3.agent [None req-f5b64995-61b2-4c26-891c-cb76afee6568 - 410c89fde3d84cb68d6f574dddf415ce - - -] Finished a router update for 834be7ac-a2ac-4125-8fda-1a54c3e9e12a
  2019-04-17 14:54:08.441 2702 INFO neutron.agent.l3.agent [None req-af5f15ed-5728-41d9-90e0-88aeadd020a9 - 49c0d60352614e6dba4257d8ad40418a - - -] Finished a router update for b6c8d929-b0aa-4d35-86dd-34a7a62c89fa
  2019-04-17 14:54:11.582 2702 INFO neutron.agent.l3.agent [None req-d5378b2e-905d-42a8-8939-aa23dbb08641 - d2ba0b9b94e244a6a69129a480a8f2d0 - - -] Finished a router update for 4247f759-827c-476b-90e9-29f725158daf
  2019-04-17 14:54:14.922 2702 INFO neutron.agent.l3.agent [None req-1829b2e3-1567-402e-8605-42ceb3d2192f - 072dc794d1d048c3a0c57831bbe2c7b9 - - -] Finished a router update for 4e7af6a8-830d-4647-8dfc-3b9b825a3c37
  2019-04-17 14:54:18.070 2702 INFO neutron.agent.l3.agent [None req-cd35fb0a-8870-4af2-b177-bff89618ecf4 - d18a6c1d1a094b3695b7b7e553e756ef - - -] Finished a router update for 9d1207e3-b8e9-4959-9d03-bded785c76bd
  2019-04-17 14:55:05.289 2702 INFO neutron.agent.l3.agent [None req-52f31054-f145-4df2-8acc-39a79e53ad10 - 6f993511df2049578d814f9c56426893 - - -] Finished a router update for 02f9e40f-715e-48f3-966a-e2f8038dc41c
  2019-04-17 14:55:14.674 2702 INFO neutron.agent.l3.agent [None req-7db354ce-6282-45fe-a0d9-98b0e4d93db5 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for e40915aa-5d5a-4b39-a823-d935b91e3255
  2019-04-17 14:59:19.380 2702 INFO neutron.agent.l3.agent [None req-0ea12c69-5e81-4cf7-97fc-cdbdedcc8125 - 6a4c2f76e5dc4f9e9addd4dcd615adbe - - -] Finished a router update for 3a9dbd08-bd30-4e7f-95c3-dda0b1b8fadc
  2019-04-17 14:59:19.567 2702 INFO neutron.agent.l3.agent [None req-a6396764-c74e-46ee-8d40-16ce59a5a859 - ce284ef67a8d457ca5f087d1ee626a83 - - -] Finished a router update for 36c9cc1c-bef2-4970-adb5-a3c42ac1a434
  2019-04-17 14:59:54.042 2702 INFO neutron.agent.l3.agent [None req-469fd4a1-591b-4447-9ba6-22f60d6f66c4 - 11fcdd40b7c34b7b9bea56b41a422ab2 - - -] Finished a router update for 3936e670-4c26-41d0-b216-0566a832bc64

  
  After set `use_helper_for_ns_read=False` and `root_helper_daemon=''`:
  2019-04-17 16:38:14.622 25866 INFO neutron.agent.l3.agent [-] Starting router update for 00b4373c-1c61-4ac6-9997-65b0f93c5f5b, action None, priority 1
  2019-04-17 16:38:14.631 25866 INFO neutron.agent.l3.agent [-] Starting router update for 039bec69-a997-4dcd-a099-a6700ef39741, action None, priority 1
  2019-04-17 16:38:14.640 25866 INFO neutron.agent.l3.agent [-] Starting router update for 03a87c31-d25f-4260-8b43-408b6f963459, action None, priority 1
  2019-04-17 16:38:14.648 25866 INFO neutron.agent.l3.agent [-] Starting router update for 13f685f3-da25-4c80-b320-edf5f7593feb, action None, priority 1
  2019-04-17 16:38:14.656 25866 INFO neutron.agent.l3.agent [-] Starting router update for 188c8e34-8790-412a-93b1-27221d5a2827, action None, priority 1
  2019-04-17 16:38:14.664 25866 INFO neutron.agent.l3.agent [-] Starting router update for 636fb7ca-da52-4c39-b2cb-8654f9e87a90, action None, priority 1
  2019-04-17 16:38:14.673 25866 INFO neutron.agent.l3.agent [-] Starting router update for 708720d6-1a67-444e-b145-921a87f826df, action None, priority 1
  2019-04-17 16:38:14.681 25866 INFO neutron.agent.l3.agent [-] Starting router update for bb98923a-ce8f-4586-bf84-a1b0e7d74bf9, action None, priority 1
  2019-04-17 16:38:23.694 25866 INFO neutron.agent.l3.agent [-] Starting router update for bcd0539a-6230-4de3-a8be-aafdf5c98132, action None, priority 1
  2019-04-17 16:38:24.127 25866 INFO neutron.agent.l3.agent [-] Starting router update for bd4b90a5-8fa1-4209-80cd-eb01bbca540c, action None, priority 1
  2019-04-17 16:38:36.203 25866 INFO neutron.agent.l3.agent [-] Starting router update for bf608480-0791-47bb-b95c-11c719696acc, action None, priority 1
  2019-04-17 16:38:36.215 25866 INFO neutron.agent.l3.agent [-] Starting router update for cf57179c-0005-4f43-9c2c-53cd46fc2328, action None, priority 1
  2019-04-17 16:38:36.225 25866 INFO neutron.agent.l3.agent [-] Starting router update for db1cfdb4-18cc-4f1a-8316-61a52f402fcd, action None, priority 1
  2019-04-17 16:38:37.764 25866 INFO neutron.agent.l3.agent [-] Starting router update for e40915aa-5d5a-4b39-a823-d935b91e3255, action None, priority 1
  2019-04-17 16:38:42.710 25866 INFO neutron.agent.l3.agent [-] Starting router update for e451f0ce-689b-438d-baa1-acd21610a295, action None, priority 1

  
  2019-04-17 16:38:23.693 25866 INFO neutron.agent.l3.agent [None req-f7091185-b4fb-4345-9c66-4ba58a16981b - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for 03a87c31-d25f-4260-8b43-408b6f963459
  2019-04-17 16:38:24.126 25866 INFO neutron.agent.l3.agent [None req-4ce442a6-0ddc-4a8f-bc30-2c2c6fdacd5d - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for 13f685f3-da25-4c80-b320-edf5f7593feb
  2019-04-17 16:38:36.203 25866 INFO neutron.agent.l3.agent [None req-322a11d4-51ea-4591-b207-58b2b77193f9 - e8c177ba044240978aa13c03479ba91a - - -] Finished a router update for 188c8e34-8790-412a-93b1-27221d5a2827
  2019-04-17 16:38:37.763 25866 INFO neutron.agent.l3.agent [None req-b3c3d41c-e9de-4fbb-9a4e-09b39d27fc19 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for bd4b90a5-8fa1-4209-80cd-eb01bbca540c
  2019-04-17 16:38:42.709 25866 INFO neutron.agent.l3.agent [None req-81be2ff5-7049-40ea-afb8-011744838127 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for 039bec69-a997-4dcd-a099-a6700ef39741
  2019-04-17 16:38:43.039 25866 INFO neutron.agent.l3.agent [None req-21ab2ab3-512c-4163-a006-8d342ea2ac9b - e8c177ba044240978aa13c03479ba91a - - -] Finished a router update for bb98923a-ce8f-4586-bf84-a1b0e7d74bf9
  2019-04-17 16:38:44.376 25866 INFO neutron.agent.l3.agent [None req-e3913fd2-6b34-470e-86e3-f423256d85af - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for 00b4373c-1c61-4ac6-9997-65b0f93c5f5b
  2019-04-17 16:38:44.416 25866 INFO neutron.agent.l3.agent [None req-f595f102-fed9-440c-a451-42ebaf3edcbd - e8c177ba044240978aa13c03479ba91a - - -] Finished a router update for 708720d6-1a67-444e-b145-921a87f826df
  2019-04-17 16:38:45.825 25866 INFO neutron.agent.l3.agent [None req-d8f77b43-f4fe-4f04-9a40-c488cf11eaf2 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for 636fb7ca-da52-4c39-b2cb-8654f9e87a90
  2019-04-17 16:38:52.694 25866 INFO neutron.agent.l3.agent [None req-cd9b9373-e64f-495f-b9c6-6050910dcbe5 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for bf608480-0791-47bb-b95c-11c719696acc
  2019-04-17 16:39:04.784 25866 INFO neutron.agent.l3.agent [None req-05300052-040a-4f28-b6c7-82b78e29356e - b3a80b3348204d15be2f36afe6873a6a - - -] Finished a router update for db1cfdb4-18cc-4f1a-8316-61a52f402fcd
  2019-04-17 16:39:06.388 25866 INFO neutron.agent.l3.agent [None req-2aaec35a-f326-4660-b097-f38cabdef986 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for e40915aa-5d5a-4b39-a823-d935b91e3255
  2019-04-17 16:39:13.406 25866 INFO neutron.agent.l3.agent [None req-4c88c40f-dafd-4731-b73a-6f95e1bf5edf - 66095bb6c95c411a86a17f89fa6af571 - - -] Finished a router update for e451f0ce-689b-438d-baa1-acd21610a295
  2019-04-17 16:39:23.395 25866 INFO neutron.agent.l3.agent [None req-4f4e768b-30e9-42cc-a58c-3d2eddf1d57e - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for cf57179c-0005-4f43-9c2c-53cd46fc2328
  2019-04-17 16:40:12.184 25866 INFO neutron.agent.l3.agent [None req-669f303b-7860-4c97-b6b9-f31fb56b84e7 - 001a18cadd4b401e9fdeab6c411d9816 - - -] Finished a router update for bcd0539a-6230-4de3-a8be-aafdf5c98132

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