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

[Gaurav P. <gau...@tc...>]

Thank you for the replies.
Leif, you mean the service was restarted and we can ignore the fact that 
the JVM was hung or not responding?

There is one more observation that i want to share. We have seen this 
similar behavior on one more client machine. This raises a doubt as to 
whether both places did someone restart the service?

Regards.
Gaurav Goel
Tata Consultancy Services
Mailto: gau...@tc...
Website: http://www.tcs.com
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From:
Leif Mortenson <lei...@ta...>
To:
wra...@li...
Date:
05/05/2011 08:14 PM
Subject:
Re: [Wrapper-user] Wrapper restarts JVM when no response from server



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

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