Re: [Wrapper-user] Service started with Java Service wrapper becoming stale during server reboot

[Divya H. <div...@gm...>]

Hi Mueller,

I tried enabling the debug level but it did no help :(.
The script to stop and start the monitoring application is put as a service
on the server and it will be run before and after the server reboot
respectively.
Before reboot, when the service is run, this is the message printed on log:
STATUS | wrapper  | 2012/04/01 03:00:47 | TERM trapped.  Shutting down.
WARN   | wrapper  | 2012/04/01 03:00:47 | JVM process was still running
after receiving a SIGCHLD signal.

After reboot, when the service is run the application is not started but
when the command to start is run individually the application is started and
the message printed is :
[root@rpc bin]# /TaskingEAI/bin/UserMonitoring start
Starting User Monitoring Application...
Removed stale pid file: TaskingEAI/bin/./UserMonitoring.pid


Thanks,
Divya



Divya Habin wrote:
> 
> Hi Mueller,
> 
> Thanks for the reply.
> 
> I will turn on the debug level and see what is going around.I will let you
> know my observations then.
> 
> Thanks,
> Divya
> 
> 
> Christian Mueller-13 wrote:
>> 
>> Hello Divya,
>> 
>> how is your script starting/stopping the processes exactly?
>> 
>> The wrapper-script whenever called to start an instance, checks for the
>> pid-file, which contains the pid of the Wrapper process.
>> If the pid from the file matches with the currently running processes,
>> then
>> it won't start the Wrapper, since it assumes the process is already
>> running.
>> The warning "Removed stale pid file", means that the pid in the pid file
>> doesn't match. So the script removes the file and starts a new instance.
>> The Wrapper removes the pid file by itself usually during exiting,
>> however
>> if the Wrapper is forcibly killed (like a kill -9), then it won't have a
>> chance to remove the file.
>> So when you run the start command after the reboot and see the stale pid
>> warning, it means probably, that the Wrapper was forcibly killed during
>> shutdown and couldn't remove the pid file.
>> 
>> could you also please turn on debug log level (wrapper.debug=TRUE) and
>> re-run?
>> 
>> Best Regards,
>> 
>> Christian Mueller
>> Tanuki Software, Ltd.
>> 
>> On Mon, Mar 5, 2012 at 6:52 PM, Divya Habin
>> <div...@gm...>wrote:
>> 
>>>
>>> I have few services that are running in a Linux machines and I am using
>>> the
>>> 3.2.3 version of  http://old.nabble.com/file/p33441896/Poller.conf
>>> Poller.conf Java Service Wrapper. Just before the sever reboot, the
>>> services
>>> are stopped using a stopall services command(that has stop command for
>>> each
>>> service).While Few services are giving out the  following warning ::
>>>  'WARN   | wrapper  | 2012/03/04 03:00:42 | JVM process was still
>>> running
>>> after receiving a SIGCHLD signal.
>>> STATUS | wrapper  | 2012/03/04 03:00:42 | TERM trapped.  Shutting down.'
>>>
>>> After the sever reboot, a startall application script(that has start
>>> command
>>> for each service) is run.It starts all the applications except those
>>> that
>>> gave the above warning.
>>>
>>> But when I try starting the service again using the start command of
>>> that
>>> particular service, it starts with the message '"Removed stale pid
>>> file:' .
>>>
>>> I want to understand here two things:
>>> 1.Why the process has become stale.
>>> 2.Why the start all application command that had the start command didn
>>> start it after removing the stale id.
>>>
>>> I am attaching the configuration file.
>>>
>>> Thanks in advance.
>>>
>>>
>>> --
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>>>
>>>
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