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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 48388] mod proxy disabling workers after a single error
Date Mon, 30 Aug 2010 22:00:42 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=48388

Alex Tavcar <saso.tavcar@ais42.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #2 from Alex Tavcar <saso.tavcar@ais42.net> 2010-08-30 18:00:38 EDT ---
After a few years since early apache httpd 2.2.x releases I give it another try
to migrate our apache httpd proxy server from 2.0.x versions to 2.2.x. Still
there is an issue with unresponsive backend servers with 503 error on apache
httpd proxy. Both versions have practically the same configuration, but with
2.0.x version we do not experience any user experience errors, while with 2.2.x
versions users get 503 errors and timeouts for simple webpages.


Old apache httpd 2.0.63 proxy error_log: 

[Fri Aug 20 10:11:42 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 20 11:47:14 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 20 17:25:16 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 20 18:07:02 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 20 19:04:31 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Sat Aug 21 06:49:18 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Sat Aug 21 17:06:21 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Sat Aug 21 18:34:41 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Sun Aug 22 11:02:49 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Mon Aug 23 08:39:00 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Tue Aug 24 16:34:32 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 07:36:21 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed


When we switch to apache httpd 2.2.16 proxy we get immediate bad user
experience hit with http 503 errors and timeouts on proxy server, while 2.2.x
backend servers have same load:

[Wed Aug 25 07:36:21 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 08:28:22 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 08:28:22 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 09:05:19 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 09:05:19 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 09:10:03 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 09:10:03 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 09:18:32 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 09:18:32 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 09:51:51 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 09:51:51 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 09:53:38 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 09:53:38 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 10:00:12 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 10:00:12 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 10:04:21 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 10:04:21 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Wed Aug 25 10:06:06 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Wed Aug 25 10:06:06 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
.....
[Fri Aug 27 09:21:53 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:22:39 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:35:38 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:35:38 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:36:22 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:36:22 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:36:36 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:37:33 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:37:33 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:41:46 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:41:46 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:42:05 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:42:05 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:42:08 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:42:08 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)
[Fri Aug 27 09:42:32 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:42:32 2010] [error] ap_proxy_connect_backend disabling worker
for (www.domain.com)

Switch back to apache httpd 2.0.63 proxy and we immediate get normal user
experience, due to
error in error_log:

[Fri Aug 27 09:43:07 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:51:34 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 09:59:50 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:00:35 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:00:35 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:20:59 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:21:00 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:34:03 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:37:59 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed
[Fri Aug 27 10:38:15 2010] [error] (110)Connection timed out: proxy: HTTP:
attempt to connect to 192.168.102.2:80 (www.domain.com) failed

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