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There is a problem in the assumptions made in JServ 1.1 (actually it is the
apjv12 protocol). It assumes that the c process (mod_jserv) should expect
an immediate reply from the java process (JServ). If this reply does not
immediately return, then it assumes that the java process is hung and resets
the JVM. This mainly occurs when running on an SMP box, using a JVM with
green threads and with a servlet that takes a long time to run (i.e. does
more than just serve up an HTML page). This is because it is easy to have a
situation where httpd (mod_jserv) is running on one processor while java is
running on another processor. If the java process is busy with a request,
it will not return the ping immediately and thus the JVM is reset. If you
run native threads, then it is more likely that there will be a waiting
thread to handle the ping request. I have been meaning (though have not had
the time) to write a patch for the code to allow for a configuration option
which will let you decide both the number of ping requests unanswered before
re-setting the JVM and allowing for time period to wait for the ping reply.
- Greg
----- Original Message -----
From: Doug Hathaway <[EMAIL PROTECTED]>
To: 'Java Apache Users' <[EMAIL PROTECTED]>
Sent: Wednesday, January 19, 2000 1:11 PM
Subject: Servlet Timeout
> ----------------------------------------------------------------
> BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> WHEN YOU POST, include all relevant version numbers, log files,
> and configuration files. Don't make us guess your problem!!!
> ----------------------------------------------------------------
>
>
> We just upgraded our Jserv from 1.0 to 1.1b3 and it appears that we are
> encountering some sort of timeout when a servlet process takes over 10
> seconds. We are failing on a export of data from a MySql table to flat
> file, this export worked fine until we upgraded our Jserv. I believe
> the problem is in the Jserv configuration, however I have not been able
> to determine the source of the problem. If anyone has a solution are a
> suggestion I would appreciate at it.
>
> Thanks
>
>
> The following are the logs that might help in answering our problem.
>
> Jserv = ApacheJServ 1.1b3
>
> Java =Blackdown jre117_v3
>
> OS = Linux
>
> Jserv_log
> ========
> [19/01/2000 09:48:53:680] (INFO) wrapper: Java VM spawned (PID=16034,
> PPID=15993)
> [19/01/2000 10:16:10:149] (INFO) wrapper: Java VM not responding
> (PID=15993) [timeout]
> [19/01/2000 10:16:10:152] (EMERGENCY) ajp12[1]: cannot scan servlet
> headers (500)
> [19/01/2000 10:16:10:152] (ERROR) an error returned handling request via
> protocol "ajpv12"
> [19/01/2000 10:16:11:159] (EMERGENCY) ajp12: ping: no reply
> (-1) Please make sure that the wrapper.classpath is
> pointing to the correct
> version of ApacheJServ.jar
> [19/01/2000 10:16:11:159] (INFO) wrapper: Java VM restarting (PID=15993)
>
> [
>
> Apache Error Log
> ==============
> [Wed Jan 19 10:26:24 2000] [error] [client ] Premature end of scrip
> t headers: /ss3script/com.kurant.sysadmin.servlet.ExportTables
>
>
>
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