Re: [Wrapper-user] Wrapper restarts JVM when no response from server

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

Gaurav,
Thank you for the detailed message.  It makes it easy to respond.

In your case, the Wrapper is shutting down because the Windows Service
Manager has sent in a stop command:

DEBUG  | wrapperp | 2011/05/03 21:52:13 | read a packet PING : ping
DEBUG  | wrapper  | 2011/05/03 21:52:16 |   SERVICE_CONTROL_STOP

When the Wrapper stops, the Service Manager is starting it again
almost immediately.

STATUS | wrapper  | 2011/05/03 21:52:18 | <-- Wrapper Stopped
DEBUG  | wrapper  | 2011/05/03 21:55:16 | Allocating a console for the service.
DEBUG  | wrapper  | 2011/05/03 21:55:16 | Found console window.
DEBUG  | wrapper  | 2011/05/03 21:55:16 | Wrapper console window
hidden successfully.
STATUS | wrapper  | 2011/05/03 21:55:16 | --> Wrapper Started as Service

This makes me think that someone pressed the Service Restart button in
the service control manager.  But I am only guessing as we do not have
any way of telling what initiated such a restart.

At the time that the Wrapper shuts down however, I do see that you are
on the 4th Java invocation since the Wrapper was launched.  The log
fragment that you sent does not include any of the 3 restarts that
took place so I am unable to see what the circumstances were around
those restarts.    Could you please locate one of them in your logs
and then send me a few minutes before the restart through a minute or
so after?

I also see that you are using 3.5.4.  The 3.5.8 version that we just
released contains some improvements which will prevent unneeded JVM
restarts on heavily IO loaded systems.  I have not seen anything yet
to show that that is the problem however.

Cheers,
Leif

On Thu, May 5, 2011 at 7:48 PM, Gaurav Pgoel <gau...@tc...> wrote:
>
> Hi,
>
> I am using Wrapper 3.5.4. I have written a java code and running it as java
> wrapper service on Windows NT machine.
> I have a code to uplaod files from client machine (on which service is
> installed) to server.
> Sometimes, it happens that the upload takes time say 5 - 10 minutes to
> upload a file. In the meantime, there is no response from server to the
> client.
>
> In this situation, I assume, that my wrapper service restarts JVM thinking
> that the jvm is hung.
>
> Due to this, there is duplicate upload happening. To avoid this, i am
> thinking of increasing wrapper ping interval to say 300 seconds. What do you
> think guys?
>
> Below is the wrapper.conf file contents:
<snip>
> *******************************************************************************************
>
> Also written below is the system logs;
> *******************************************************************************************
<snip>
> *******************************************************************************************
>
>
> Guys what your views on this? Is this really because Wrapper thinks that the
> JVM is hung? Or is it because of some other reason?
>
> Thanks in advance to all.
>
> Regards,
> Gaurav Goel
> Tata Consultancy Services
> Mailto: gau...@tc...
> Website: http://www.tcs.com