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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 44454] busy count reported in mod_jk inflated, causes incorrect balancing
Date Mon, 14 Apr 2008 13:29:07 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=44454





--- Comment #16 from Paul Martin <pcmartin@gmail.com>  2008-04-14 06:29:06 PST ---
I forgot to mention the rate of the leak... we last did a restart about 48
hours ago.  We seem to be incrementing the busy count by about 200 per day.

(In reply to comment #15)
> We've noticed this problem in our production environment as well...  At present
> it is a low-load point in the day (when we are processing ~20 requests), yet
> the busy count is reported as being 400+ (which is about MAX - 20 in
> jk-status).  
> 
> Nothing short of restarts seem to correct the count.
> 
> I've literally tried all the timeout values I could find (on both ends - mod_jk
> and jboss) - keeping of course in mind their intended purposes as described in
> the docs - but none seemed to have any effect on the busy count not
> decrementing.
> 
> I did a jboss thread dump and found 146 threads with the word "8009" in it, but
> according to Rainer's analysis only a handful (11 to be exact - I grepped
> RUNNABLE threads only) of them are actually processing requests.
> 
> Curiously enough, we did not seem to have this issue in our test environment
> (with nearly identical configurations), even after intensive load testing.
> 
> I'm not sure if this is something specific to our environment.  For the record:
> 
> SunOS mega 5.10 Generic_127111-06 sun4v sparc SUNW,Sun-Fire-T200
> 
> Server Version: Apache/2.2.6 (Unix) mod_jk/1.2.25
> JK Version:     mod_jk/1.2.25
> 
> Server version: Apache/2.2.6 (Unix)
> Server built:   Jan 19 2008 22:12:59
> Server's Module Magic Number: 20051115:5
> Server loaded:  APR 1.2.11, APR-Util 1.2.10
> Compiled using: APR 1.2.11, APR-Util 1.2.10
> Architecture:   32-bit
> Server MPM:     Worker
>   threaded:     yes (fixed thread count)
>     forked:     yes (variable process count)
> Server compiled with....
>  -D APACHE_MPM_DIR="server/mpm/worker"
>  -D APR_HAS_SENDFILE
>  -D APR_HAS_MMAP
>  -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
>  -D APR_USE_FCNTL_SERIALIZE
>  -D APR_USE_PTHREAD_SERIALIZE
>  -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
>  -D APR_HAS_OTHER_CHILD
>  -D AP_HAVE_RELIABLE_PIPED_LOGS
>  -D DYNAMIC_MODULE_LIMIT=128
>  -D HTTPD_ROOT="/usr/local/httpd-cls01"
>  -D SUEXEC_BIN="/usr/local/httpd-cls01/bin/suexec"
>  -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
>  -D DEFAULT_ERRORLOG="logs/error_log"
>  -D AP_TYPES_CONFIG_FILE="conf/mime.types"
>  -D SERVER_CONFIG_FILE="conf/httpd.conf"
> 
> 
> We are currently running in degraded mode due to a session replication issue,
> so for the time being only one node is responding to requests.  Perhaps this is
> part of the equation?
> 


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