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Posted to dev@tomcat.apache.org by bu...@apache.org on 2006/10/19 01:57:36 UTC
DO NOT REPLY [Bug 40792] New: - 500 error from Tomcat causes modjk lb worker to consider tomcat unusable for timeout period
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Summary: 500 error from Tomcat causes modjk lb worker to consider
tomcat unusable for timeout period
Product: Tomcat 5
Version: 5.5.15
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Native:JK
AssignedTo: tomcat-dev@jakarta.apache.org
ReportedBy: ken@i2rd.com
It seems that there is a bug in the error handling code in the lb worker.
I was using a modjk/tomcat configuration with a lb worker and two ajp13 workers.
One of the ajp13 workers was marked disabled and stopped. The other tomcat
worker returned a 500 HTTP response for one user of the system. This caused the
following log messages from modjk code:
[Mon Oct 16 13:39:16 2006] [info] ajp_process_callback::jk_ajp_common.c (1375):
Connection aborted or network problems
[Mon Oct 16 13:39:16 2006] [info] ajp_service::jk_ajp_common.c (1719): Receiving
from tomcat failed, because of client error without recovery
in send loop 0
[Mon Oct 16 13:39:16 2006] [info] service::jk_lb_worker.c (677): unrecoverable
error 400, request failed. Client failed in the middle of requ
est, we can't recover to another instance.
[Mon Oct 16 13:39:16 2006] [info] jk_handler::mod_jk.c (1970): Aborting
connection for worker=lb
The error caused other users at the time to receive 503 error from apache
because modjk considered no workers to be OK. After awhile (about 1 minute)
modjk recognized that the Tomcat worker was ok and started working again.
In looking at the code, it appears that the problem might be that the worker's
busy flag is not cleared in this snippet of code:
(from jk_lb_worker.c: line 666 revision 1.89)
else if (service_stat == JK_CLIENT_ERROR) {
/*
* Clent error !!!
* Since this is bad request do not fail over.
*/
rec->s->errors++;
rec->s->in_error_state = JK_FALSE;
rec->s->in_recovering = JK_FALSE;
rec->s->error_time = 0;
*is_error = is_service_error;
jk_log(l, JK_LOG_INFO,
"unrecoverable error %d, request failed."
" Client failed in the middle of request,"
" we can't recover to another instance.",
is_service_error);
JK_TRACE_EXIT(l);
return JK_CLIENT_ERROR;
}
The JK_WORKER_IN_ERROR and JK_WORKER_USABLE macros check the is_busy flag so it
seems that not clearing it could cause a problem.
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DO NOT REPLY [Bug 40792] - 500 error from Tomcat causes modjk lb worker to consider tomcat unusable for timeout period
Posted by bu...@apache.org.
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------- Additional Comments From ken@i2rd.com 2006-10-19 07:21 -------
modjk 1.2.13
apache 2.0.55
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DO NOT REPLY [Bug 40792] - 500 error from Tomcat causes modjk lb worker to consider tomcat unusable for timeout period
Posted by bu...@apache.org.
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rainer.jung@kippdata.de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
------- Additional Comments From rainer.jung@kippdata.de 2006-10-19 11:45 -------
Please update to 1.2.19. There have been a lot of bug fixes since 1.2.13.
If the bug can still be observed with 1.2.19 please reopen this ticket and I
will investigate.
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DO NOT REPLY [Bug 40792] - 500 error from Tomcat causes modjk lb worker to consider tomcat unusable for timeout period
Posted by bu...@apache.org.
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------- Additional Comments From rainer.jung@kippdata.de 2006-10-18 21:28 -------
Which version of mod_jk?
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