Re: [Wrapper-user] "JVM appears hung": Wrapper restarts webserver every week

[Leif M. <le...@ta...>]

Andreas,
Most likely the Java process is being starved of CPU and that is
leading to the Wrapper thinking it is frozen.   If that is the case
then you can easily resolve the problem by setting the following
property:
wrapper.ping.timeout=120
(http://wrapper.tanukisoftware.org/doc/english/prop-ping-timeout.html)

That will tell the Wrapper to allow the JVM to be frozen for 120
seconds before it is killed.  The default is 30 seconds.

However, your web site would be unresponsive during that period still.
 Most likely it is now for at least 30 seconds.  Do the restarts
happen at any particular time each week?  Is there some large DB
processing being done that is consuming all of the CPU?  It may be
necessary to move the Database over to another physical server to make
sure your app server is not being affected by that processing.

If you set the wrapper.debug=TRUE property and then reproduce this, I
might be able to tell you a little more information about what is
happening prior to the restart.  I would only need the 3-5 minutes of
time prior to the Wrapper timing out and killing the JVM.

There have also been several bugs fixed since 3.0.5 which could affect
this.  Please review the release-notes:
http://wrapper.tanukisoftware.org/doc/english/release-notes.html

Cheers,
Leif

On Thu, Apr 16, 2009 at 5:55 PM, Andreas Karlsson
<and...@ya...> wrote:
>
> Hi wrapper-folks!
> I would love some hints and ideas on how to debug this problem and find a solution.
>
> The system is a
> - windows server 2003
> - jettyserver
> - java 1.4.1
> - wrapper 3.0.5
>
> It has been running for years without any problems. But after some updates of the
> data in the database where the web-content is stored and a recompile of the code it
> started to produce these messages (pasted below). It happens approximately once
> every week.
> How can I debug this?
> Is there a way to trigg a dump when it happens?
>
>
> ERROR  | wrapper  | 2009/04/15 10:17:07 | JVM appears hung: Timed out waiting for
> signal from JVM.
> ERROR  | wrapper  | 2009/04/15 10:17:07 | Java Virtual Machine did not exit on
> request, terminated
> STATUS | wrapper  | 2009/04/15 10:17:13 | Launching a JVM...
> INFO   | jvm 2    | 2009/04/15 10:17:14 | Wrapper (Version 3.0.5)
>
> brgds
> Andreas