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Posted to bugs@httpd.apache.org by bu...@apache.org on 2011/03/11 18:13:39 UTC
DO NOT REPLY [Bug 50916] New: RewriteMap program: mod_rewrite sends
request but does not read response?!?!
https://issues.apache.org/bugzilla/show_bug.cgi?id=50916
Summary: RewriteMap program: mod_rewrite sends request but does
not read response?!?!
Product: Apache httpd-2
Version: 2.2.17
Platform: PC
OS/Version: Solaris
Status: NEW
Severity: normal
Priority: P2
Component: mod_rewrite
AssignedTo: bugs@httpd.apache.org
ReportedBy: marco.walther@sun.com
Created an attachment (id=26764)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=26764)
mod_rewrite additional debug logs
It looks like a thread acquires the lock, sends a request line to the map
program and `disappears'??
The next thread acquires the lock (?) sends it's request line and reads the
response from the previous request:-(
After that, the synchronisation is broken:-(
I added a couple of debug prints to mod_rewrite (diff attached) and they
generated the following log (after about two days of running fine:-()
-------------------------------------------------------------
ii.247 - - [10/Mar/2011:10:02:27 +0000]
usersguide.bd/sid#81f8778rid#9381588/initial (1) mw before
lookup_map_program(http://ih/api;usersguide) thread= 0x00000014
ii.247 - - [10/Mar/2011:10:02:27 +0000]
usersguide.bd/sid#81f8778rid#9381588/initial (1) mw lookup_map_program thread=
0x00000014 aquire_lock
ii.247 - - [10/Mar/2011:10:02:28 +0000]
versioncontrol.bd/sid#81f8778rid#98d7060/initial (1) mw before
lookup_map_program(http://ih/api;versioncontrol) thread= 0x00000009
ii.247 - - [10/Mar/2011:10:02:28 +0000]
versioncontrol.bd/sid#81f8778rid#98d7060/initial (1) mw lookup_map_program
thread= 0x00000009 aquire_lock
ii.247 - - [10/Mar/2011:10:02:28 +0000]
versioncontrol.bd/sid#81f8778rid#98d7060/initial (1) mw lookup_map_program
thread= 0x00000009 release_lock
ii.247 - - [10/Mar/2011:10:02:28 +0000]
versioncontrol.bd/sid#81f8778rid#98d7060/initial (1) mw after
lookup_map_program(http://ih/api;versioncontrol)= /projects/usersguide/content
thread= 0x00000009
ii.247 - - [10/Mar/2011:10:02:28 +0000]
versioncontrol.bd/sid#81f8778rid#98d7060/initial (1) go-ahead with proxy
request
proxy:balancer://ch/projects/usersguide/content/subversion/teepee/svnclientadapter.html
[OK]
Thread 0x14 acquires the lock but somehow 0x09 can acquire the lock as well and
gets the line actually intended for 0x14. It looks like 0x14 never finishes
that request. It's later showing up with other requests. But after this, the
results are off by one line.
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DO NOT REPLY [Bug 50916] RewriteMap program: mod_rewrite sends
request but does not read response?!?!
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=50916
--- Comment #1 from Stefan Fritsch <sf...@sfritsch.de> 2011-04-08 15:45:15 EDT ---
Look into the error log, too. Maybe the process with thread 0x00000014 died at
that time?
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DO NOT REPLY [Bug 50916] RewriteMap program: mod_rewrite sends
request but does not read response?!?!
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=50916
CaioToOn! <ca...@caiotoon.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |caio@caiotoon.com
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DO NOT REPLY [Bug 50916] RewriteMap program: mod_rewrite sends
request but does not read response?!?!
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=50916
--- Comment #2 from Marco Walther <ma...@sun.com> 2011-04-08 16:50:07 EDT ---
I looked in the error log and everywhere. No sign of sudden thread-death:-( so
I'm somewhat at a loss there:-(
My solution :-( to the problem is to send a timestamp along to the mapping
helpers and they send it back with their response. So I can read again when I
find a response from a previous request.
I would still like to know where those threads go:-(
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DO NOT REPLY [Bug 50916] RewriteMap program: mod_rewrite sends
request but does not read response?!?!
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=50916
--- Comment #3 from CaioToOn! <ca...@caiotoon.com> 2011-05-31 19:40:32 UTC ---
Hi, there.
I'm facing the sync problem. I'm also using mod_rewrite with external map
program, written in Java.
My problem rarely happens on my production server, and some days the server is
messed up, out of the blue. I'm trying to force the problem to happen again,
with no success. I've created a program that starts 65 threads that
continuously ask for a random URL on the server in a random ammount of
milliseconds, then checks to see if the page matches the expected result. I've
create another 25 threads that in a random time kill one of the 65 threads and
recreate it, willing to stop the connection abruptly in the middle.
The program is running for several minutes without issuing the sync error.
Do you guys have any tips on forcing this error to happen consistently, so we
could start to understand it?
Cheers,
CaioToOn!
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