Hi,
usually those info messages indicate, that the request took to long, so
the user in front of the browser did a retry or back or something
similar. In this case the browser closes the existing connection to the
web server, although parts of the response are still missing. When
Tomcat send the next part of the response to the web server (e.G. Apache
httpd), and the web server tries to send it back to the client
(=browser), it detects a closed connection and this info message gets
written into the log.
Depending on your load, the performance of the app and the patience of
your users, a message every 20 to 30 seconds seems a bit to much.
You can add %D to your httpd access log, which will log microseconds
response time to the access log, and also %{pid}P and %{tid}P, which
will give the process id and the thread id of the thread serving the
request. mod_jk also logs the process id and thread id automatically for
each line, so there is a chance, that you can match those lines and find
out, if they come from special requests (e.g. long running ones), from
special users (IPs, Browsers) etc.
For the httpd access log configuration see
http://httpd.apache.org/docs/2.2/mod/mod_log_config.html
Caution: the timestamp in the jk log file, is the moment the problem got
detected, the time stamp in the access log is the moment the request
started (so you need to add the %d value to make them match).
Some more hints about your config included below.
Regards,
Rainer
Ingo Düppe wrote:
Hello,
I found the following lines in my mod_jk.log every 20 to 30 seconds for
all of my instances.
[info] jk_ajp_common.c (1511): Writing to client aborted or client
network problems
[info] jk_ajp_common.c (1996): (plexus12) request failed, because of
client write error without recovery in send loop attempt=0
[info] jk_lb_worker.c (1092): unrecoverable error 200, request failed.
Client failed in the middle of request, we can't recover to another
instance.
[info] mod_jk.c (2270): Aborting connection for worker=plexus
First I thought, this is caused because of some related network traffic
problem, but also the two Tomcat instances on the same machine appear in
the log.
My configuration exist of Windows 2003 SP2 Servers, Apache httpd 2.2.6,
mod_jk 1.2.25, and Tomcat 6.0.14.
Please, can anybody tell me what's wrong with my configuration and what
is the meaning of these lines.
Thx in advanced
Ingo
My workers.properties:
workers.tomcat_home="C:\Server\tomcat-6.0.14"
workers.java_home="c:\java\jdk-6.0"
ps=\
The three above are not used since a long time. Remove them.
worker.list=plexus,jkstatus
worker.plexus11.port=8109
worker.plexus11.host=openuss01
worker.plexus11.type=ajp13
worker.plexus11.lbfactor=10
...
worker.plexus52.port=8209
worker.plexus52.host=openuss05
worker.plexus52.type=ajp13
worker.plexus52.lbfactor=10
worker.jkstatus.type=status
worker.plexus.type=lb
worker.plexus.sticky_session=true
worker.plexus.socket_timeout=20
worker.plexus.reply_timeout=3000
3 seconds reply timeout sounds a bit ambitious (but I don't know what
your app does)
worker.plexus.max_reply_timeouts=40000
This max_reply_timeouts sounds a bit high. It controls after how many
reply_timeouts a single sub worker of an lb gets put into an error state
(and thus will not be used for a minute, before it gets tried again).
The counter gets incremented for each reply_timeout missed and gets
divided by 2 about every minute. So assuming a steady flow of missed
reply_timeouts, the value 40000 corresponds to about 20000
reply_timeouts missed per minute.
worker.plexus.balance_workers=plexus11,plexus21,plexus12,plexus22,plexus51,plexus31,plexus52
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