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Re: [Wrapper-user] Shutdown hook does not have enough time to complete
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From: Markus S. <sc...@gm...> - 2007-12-19 14:16:04
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I think i am getting mad. I've checked the whole code for System.exit() statements. I've tested 1000 times, always with the same result that our ShutdownHook does not finish. I've also added a finally-clause in the shutdown hook, but even that will not be executed (so there is no exception, the VM just exits). I've also experimented with increasing the shutdown- and jvm-exit-timeouts, but with no success. I've now changed our maintenance code. We no longer use a ShutdownHook to cleanup and shutdown the services, since this seems not to work reliable. Instead we register as a WrapperEventListener on startup and trap all Control and ServiceControl Events that must lead in a shutdown and perform our cleanup there in. Because WrapperManager.restart() and WrapperManager.stop() do not fire such events, I have to handle these cases additionally (shutdown/restart performed from within our AdministrationClient). In our trunk, I would like to implement WrapperListener instead of WrapperEventListener, but then I require some new License for our 3.3-alpharelease. Do you think this is a reasonable workaround? Markus 2007/12/19, Leif Mortenson <le...@ta...>: > > Markus, > Looking at your log, the Wrapper is not doing anything special like > killing the jvm process. In that case, the JVM is handling the > shutdown of the JVM. The Wrapper simply calls System.exit in this > case and runs its own shutdown hook to clean up after itself. > > The JVM should be waiting for all normal shutdown hooks to > complete before the JVM exits. Are you certain that your JVM > is not exiting due to an exception of some kind? try adding a > Try finally block and see if that code is getting run. > > Cheers, > Leif > > > > Markus Schlegel wrote: > > Hi > > We have encountered a problem with service wrapper (3.2 and 3.3). > > We use the WrapperSimpleApp as integration method. We have registred > > our own Shutdown hook. > > When we stop the service using the service mgmt console, some parts of > > the Shutdown hook runs, but the vm is being terminated before the > > shutdownhook is finished. > > See the logfile using the debug-option: > > > > wrapper | 2007/12/19 10:49:49 | SERVICE_CONTROL_STOP > > wrapper | 2007/12/19 10:49:49 | wrapperStopProcess(0) called. > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: Received a > > packet SERVICE_CONTROL_CODE : 1 > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: > > ServiceControlCode from Wrapper with code 1 > > wrapper | 2007/12/19 10:49:49 | Sending stop signal to JVM > > wrapperp | 2007/12/19 10:49:49 | send a packet STOP : NULL > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: Received a > > packet STOP : > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: Thread, > > Wrapper-Connection, handling the shutdown process. > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: calling > > listener.stop() > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: Waiting for > > WrapperListener.stop runner thread to complete. > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: > > WrapperListener.stop runner thread started. > > jvm 1 | 2007/12/19 10:49:49 | WrapperSimpleApp Debug: stop(0) > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: > > WrapperListener.stop runner thread stopped. > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: returned from > > listener.stop() -> 0 > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: shutdownJVM(0) > > Thread:Wrapper-Connection > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: Send a packet > > STOPPED : 0 > > wrapperp | 2007/12/19 10:49:49 | read a packet STOPPED : 0 > > wrapper | 2007/12/19 10:49:49 | JVM signalled that it was stopped. > > jvm 1 | 2007/12/19 10:49:49 | WrapperManager Debug: Closing socket. > > wrapperp | 2007/12/19 10:49:49 | socket read no code (closed?). > > wrapperp | 2007/12/19 10:49:49 | server listening on port 32001. > > jvm 1 | 2007/12/19 10:49:50 | WrapperManager Debug: calling > > System.exit(0) > > > > -->this is our shutdown hook now > > > > jvm 1 | 2007/12/19 10:49:50 | (Log INFO): Shutdown hook called > > jvm 1 | 2007/12/19 10:49:50 | (Log INFO): Stop Server > > jvm 1 | 2007/12/19 10:49:50 | (Log INFO): Wenn der Server eine > > grosse Anzahl Daten sichern muss, kann dies eine Weile dauern... > > jvm 1 | 2007/12/19 10:49:50 | (Log INFO): All cabinets closed. > > jvm 1 | 2007/12/19 10:49:50 | (Log INFO): Stop services... > > > > -->this was the last message of our shutdown hook, but there shuld > > come more than that... > > > > wrapper | 2007/12/19 10:49:50 | JVM process exited with a code of 0, > > leaving the wrapper exit code set to 0. > > wrapper | 2007/12/19 10:49:50 | JVM exited normally. > > wrapper | 2007/12/19 10:49:50 | <-- Wrapper Stopped > > > > > > > > > > It seems to me, that our Shutdown hook is interrupted by the exit of > > the VM. Also the log is not always exactly the same, sometimes our > > shutdown hook has no time to start running at all. > > Is this exit of the VM caused by the wrapper? > > Is this a bug? > > I think the documentation on the website for integration method 1 is > > wrong when you look at the behavior above. > > > > > > > > Thanks > > Markus > > ------------------------------------------------------------------------ > > > > > ------------------------------------------------------------------------- > > SF.Net email is sponsored by: > > Check out the new SourceForge.net Marketplace. > > It's the best place to buy or sell services > > for just about anything Open Source. > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Wrapper-user mailing list > > Wra...@li... > > https://lists.sourceforge.net/lists/listinfo/wrapper-user > > > > > ------------------------------------------------------------------------- > SF.Net email is sponsored by: > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services > for just about anything Open Source. > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > _______________________________________________ > Wrapper-user mailing list > Wra...@li... > https://lists.sourceforge.net/lists/listinfo/wrapper-user > |
