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Posted to bugs@httpd.apache.org by bu...@apache.org on 2008/10/05 05:23:33 UTC
DO NOT REPLY [Bug 45950] New: Workers parameter is invalid after
graceful restart
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
Summary: Workers parameter is invalid after graceful restart
Product: Apache httpd-2
Version: 2.2.9
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy_balancer
AssignedTo: bugs@httpd.apache.org
ReportedBy: harada@sysrdc.ns-sol.co.jp
Workers shared parameter (ex. route) is invalid after graceful restart.
For example, my config is like this:
ProxyPass /test balancer://mycluster/test stickysession=abc
<Proxy balancer://mycluster>
BalancerMember http://10.1.1.10 route=r10
BalancerMember http://10.1.1.20 route=r20
</Proxy>
On balancer-manager:
StickySession Timeout FailoverAttempts Method
abc 0 1 byrequests
Worker URL Route RouteRedir Factor Set Status Elected To From
http://10.1.1.10 r10 1 0 Ok 0 0 0
http://10.1.1.20 r20 1 0 Ok 0 0 0
And I change the first worker of my config like this:
ProxyPass /test balancer://mycluster/test stickysession=abc
<Proxy balancer://mycluster>
BalancerMember http://10.1.1.99 route=r99
BalancerMember http://10.1.1.20 route=r20
</Proxy>
After graceful restart, balancer-manager shows:
StickySession Timeout FailoverAttempts Method
abc 0 1 byrequests
Worker URL Route RouteRedir Factor Set Status Elected To From
http://10.1.1.99 r10 1 0 Ok 0 0 0
http://10.1.1.20 r20 1 0 Ok 0 0 0
The first worker's route is invalid. r99 is expected.
This bug is caused by not clearing the shared area (scoreboard) on graceful
restart.
The shared area is cleared on normal restart in pre_mpm hook.
Attached patch is against 2.2.9 and fixes this bug by clearing the shared area.
The patch may fix Bug#39811 and Bug#44736.
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
Jim Jagielski <ji...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |WONTFIX
--- Comment #7 from Jim Jagielski <ji...@apache.org> 2011-08-04 14:50:16 UTC ---
WONTFIX - 2.2.x does not guarantee local changes via balancer-manager are kept
This is a feature in 2.3/2.4
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
--- Comment #1 from Tomokazu Harada <ha...@sysrdc.ns-sol.co.jp> 2008-10-04 20:25:07 PST ---
Created an attachment (id=22671)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=22671)
Clearing the LB-scoreboard patch
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
--- Comment #2 from Ruediger Pluem <rp...@apache.org> 2008-10-06 04:04:00 PST ---
Thanks for the patch, but I think it has some undesired side effects. The
problem is that during a graceful restart other processes still use the *old*
data in the scoreboard and we cannot simply delete it beneath them. In order to
solve this properly some deeper thoughts need to be made how to manage this
shared configuration data in a better way.
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
--- Comment #3 from Satoshi Ebisawa <eb...@gmail.com> 2009-11-05 02:28:16 UTC ---
Created an attachment (id=24487)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=24487)
fix graceful restart problem
I think this problem was caused by improper use of worker index.
In http-2.2.14, worker id (member "id" of sturct proxy_worker)
is used for search key of scoreboard data (struct proxy_worker_stat).
But worker id is inappropriate value for search key of scoreboad data
because worker id might be changed after graceful restart
because configured number of workers can be changed.
(struct proxy_worker is not stored in scoreboard so its id is not saved)
Shared parameter broken after graceful restart is caused by
use of wrong index for scoreboard data.
Attached patch introduces fixed key for scoreboard data
generated from server's hostname and worker name.
Since these are never changed after graceful restarts,
it's suitable for search key of scoreboard data.
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
jisakiel@yahoo.es changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jisakiel@yahoo.es
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[Bug 45950] Workers parameter is invalid after graceful restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
tarun@reddyemail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|WONTFIX |DUPLICATE
--- Comment #8 from tarun@reddyemail.com ---
It appears by the WONTFIX comment that this is another instance of the same bug
being misread. This is when you actually change the file on the filesystem and
do a graceful, apache comes back with the workers all corrupted.
I believe that this may be a duplicate of 44736. I have recently tested in
Oracle Linux 6 with httpd-2.2.15-15.0.1.el6.x86_64 from upstream and am seeing
same behavior even on a site with little to no traffic.
The suggestion to restart the server, esp. on a busy server, is completely
broken. It causes a significant perceived downtime.
*** This bug has been marked as a duplicate of bug 44736 ***
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
--- Comment #4 from Olivier BO <ol...@europarl.europa.eu> 2010-01-29 03:32:09 UTC ---
Compiled and installed Apache 2.2.14 on Sparc Solaris 9.
Problem remains : if you modify the configuration (at least adding or removing
one or more virtual hosts) and do a graceful restart, scroreboard appears
corrupted and load balancing does not keep routes, which causes problems to
applications that are not stateless.
Tried patch proposed by Satoshi Ebisawa but I get continuous errors at startup
[notice] child pid ... exit signal Segmentation fault (11)
and the web server never works.
Did anybody experience the same problem... and fixed it?
TIA,
Olivier
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
--- Comment #6 from Olivier BOËL <ol...@europarl.europa.eu> 2011-07-14 06:20:32 UTC ---
This bug can be reproduced with Apache 2.2.19 on Solaris
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DO NOT REPLY [Bug 45950] Workers parameter is invalid after graceful
restart
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
--- Comment #5 from Ruediger Pluem <rp...@apache.org> 2010-01-29 07:15:22 CET ---
This is a known issue. Do a hard restart of httpd (aka. stop (or graceful stop)
and start) when changing these configuration parameters.
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