Re: [Wrapper-user] Anchor file mysteriously getting deleted immediately

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

John,
    Sorry for the slow response, the bill paying demands on my time have 
been a bit
overwhelming lately... :-/
    Great grasp of the code, that is indeed the problem.  A great 
example of what
open source is meant to be. :-)

    Anyway, I will write it up in your bug as well, but the this is 
actually a problem with
the wrapper.pidfile as well as the wrapper.anchorfile.  Both will be 
deleted on shutdown
if the Wrapper is launched with the -t, -p, -r, or -i commands.  None of 
which should be
doing so.   This was introduced in a recent version when I cleaned up 
and centralized
the shutdown code.  Oops.  I don't usually use the anchor file on 
Windows so I had
not noticed this problem.

    Anyway, I have put the fix into CVS.   As you mentioned, a 
workaround is to
specify a dummy anchorfile when using any of the above commands:
Wrapper.exe -t ../conf/wrapper.conf wrapper.anchorfile=dummy 
wrapper.pidfile=dummy

    Cheers,
    Leif

John Mazzitelli wrote:

>OK, so I have more information on this and know the problem - it is a
>bug that I will write up.
>
>When I press the "start" button on MSWindows's Services GUI, the JBoss
>instance starts up fine.
>
>Its only when I issue a wrapper.exe -t will the anchor file come and go
>quickly.
>
>Looking at the code, wrapper_win.c lines 2745-2751, I see the anchor
>file gets created when -c is used.  Lines  2777-2785 create the anchor
>file with -s (this is why pressing the start button in the Windows
>Services GUI works).
>
>However, look at the -t - there is no code to write that anchor file.
>This is probably intentional - since I think when you start the wrapper,
>it ends up starting up with "-s" (in other words, the wrapper process
>that starts with -t is a short-lived process - just issues the start
>command and exits - it isn't the "true" wrapper so it should not create
>the anchor).
>
>However, -t still goes through the same exit routine - which means
>appExit() is called (last line in main()).  In appExit(), there is the
>unlink to remove the anchor file.
>
>Since -s and -c never return, that appExit() isn't called until the
>appropriate time.  However, -t exits immediately and thus deletes the
>anchor file (the anchor file is created when the service is started
>(with the -s)).
>
>It's a race condition - the -s wrapper service starts, creates the
>anchor then the -t process, seeing that the service started, exits.  But
>it then immediately deletes the anchor file.
>
>I'll write this up as a bug.  Somehow, there needs to be a global flag
>to say, "wrapper.exe is exiting, but don't delete the anchor or pid
>files".  And appExit() needs to only delete the files if that flag tells
>it to.
>
>Work around is probably to pass in on the command line to wrapper.exe a
>bogus setting for anchorfile (one different than the real anchorfile
>setting in .conf).  The -t process should try to delete that bogus file
>(and fail) leaving the real anchor file alone.
>
>  
>
>>-----Original Message-----
>>From: John Mazzitelli 
>>Sent: Monday, January 24, 2005 10:13 AM
>>To: 'wra...@li...'
>>Subject: Anchor file mysteriously getting deleted immediately 
>>upon startup
>>
>>[sorry for dup - originally sent this to Help forum; just now 
>>found out that is old and that I should be sending to this 
>>mailing list]
>>
>>I am seeing some weird behavior dealing with the anchorfile. 
>>I have my anchorfile set. And under certain conditions, I 
>>have seen it work. For example, if I start in -c console 
>>mode, it works (anchorfile is created and the JVM will die 
>>when I specifically delete it). 
>> 
>>I can see this work when I install the wrapper as an NT 
>>service BUT ONLY if i start the service using the Windows GUI 
>>utility (the Services GUI from Administration tools). If, 
>>however, I start the Windows service via the -t wrapper 
>>option, the JVM starts up fine, but immediately the 
>>anchorfile gets deleted and the wrapper immediately shuts the 
>>JVM down. It is very weird- I have no idea why or who is 
>>deleting that anchor file - but as soon as it gets created 
>>(no more than a second or two delay) that anchor file gets deleted. 
>> 
>>And this only happens if i start the service using the -t. 
>>Again, if I start the service using the Winows Services GUI, 
>>it all works fine. 
>> 
>>See below for my debug log - note the time stamps and see 
>>that the anchorfile gets deleted rather quickly after startup. 
>> 
>>Has anyone seen this behavior, or more importantly, how to fix it? 
>> 
>>---- 
>>INFO | jvm 1 | 2005/01/22 00:53:38 | 00:53:38,567 INFO 
>>[NamingService] Started jnpPort=1099, rmiPort=1098, 
>>backlog=50, bindAddress=/0.0.0.0, Client SocketFactory=null, 
>>Server 
>>SocketFactory=org.jboss.net.sockets.DefaultSocketFactory@ad093076 
>>STATUS | wrapper | 2005/01/22 00:53:38 | JBoss [abc-dpl] started. 
>>INFO | jvm 1 | 2005/01/22 00:53:40 | 00:53:40,120 INFO 
>>[Server] JBoss (MX MicroKernel) [4.0.0 (build: 
>>CVSTag=JBoss_4_0_0 date=200412201046)] Started in 2s:604ms 
>>STATUS | wrapper | 2005/01/22 00:53:41 | Anchor file deleted. 
>>Shutting down. 
>>DEBUG | wrapper | 2005/01/22 00:53:41 | wrapperStopProcess(0) called. 
>>DEBUG | wrapper | 2005/01/22 00:53:41 | Sending stop signal to JVM
>>
>>FWIW: I set wrapper.anchor.poll_interval to something higher 
>>(15 seconds) and it still behaves as I describe in my first 
>>post. If I start with -t, the JVM stays up for 15 seconds, 
>>but the anchor file is gone almost immediately. So, after the 
>>15 seconds are up, since the file is gone, the JVM is 
>>shutdown. It looks like as soon as the wrapper spits out the 
>>log "wrapper | <my service name> started.", that's when the 
>>anchor file gets deleted. 
>> 
>>Don't know if any of this helps. I looked at the C code but 
>>nothing jumped out at me as to a possible problem. Should I 
>>write this up as a bug or am I missing something obvious?
>>
>>    
>>
>
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