Re: [Wrapper-user] JVM can't restart

[Chuck W. <ch...@ma...>]

Hi Andre,

I had this same problem and worked around it with these additional
config keys:

> # Restart on all but normal exits (also works around problem where
> wrapper.restart.delay ignored on jvm halts like SIGSEGV)
> wrapper.on_exit.default=3DRESTART
> wrapper.on_exit.0=3DSHUTDOWN
>

With this config, the first restart attempt (which ignores
wrapper.restart.delay) will still fail, but that failure will cause a
second restart attempt that will honor the delay and thus succeed.

You might also find this useful:

> # Restart on OOM
> wrapper.filter.tigger.1=3Djava.lang.OutOfMemoryError
> wrapper.filter.action.1=3DRESTART
>

Chuck


Andr=E9 Schild wrote on 11/21/2006 07:44 AM:
> Hello,
>
> we are using the service wrapper with good success.
> But we have one thing who troubles it a bit.
>
> Sometimes when a JVM is killed due to out of memory errors, the JVM is 
> not restarted.
> But most of the time it restarts just fine.
>
> In the logfile we see this:
>
> ERROR  | wrapper  | 2006/11/21 15:11:33 | JVM appears hung: Timed out 
> waiting for signal from JVM.
> STATUS | wrapper  | 2006/11/21 15:11:33 | Dumping JVM state.
> ERROR  | wrapper  | 2006/11/21 15:11:38 | JVM did not exit on request, 
> terminated
> STATUS | wrapper  | 2006/11/21 15:11:38 | JVM exited in response to 
> signal SIGKILL (9).
> ERROR  | wrapper  | 2006/11/21 15:11:38 | Unable to start a JVM
> STATUS | wrapper  | 2006/11/21 15:11:38 | <-- Wrapper Stopped
>
> In the wrapper config we have these parameters:
>
> wrapper.request_thread_dump_on_failed_jvm_exit=3DTRUE
> wrapper.restart.delay=3D15
> wrapper.restart.reload_configuration=3DTRUE
>
>
> What seems strange is the fact that between the "JVM exited in response=
 
> to signal SIGKILL (9)." and the "Unable to start a JVM" there is no 15 
> second delay. The one configured as restart.delay.
>
> So we assume that the new JVM can't instaltly restart, because the old 
> one is not completely shutdown yet.
>
> After such a error condition we can just restart it without any problem=
s.
>
> Andr=E9
>
>
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