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Chad,
On 10/18/2011 5:32 PM, chad.da...@emc.com wrote:
> I'm migrating a 5.5 version of tomcat. Whoever set this up in the
> first place, modified catalina.sh to make every stop a force.
> Here's the modified stop section of catalina.sh.
>
> # Force a shutdown every time. # if [ $FORCE -eq 1 ]; then if [ !
> -z "$CATALINA_PID" ]; then echo "Killing: `cat $CATALINA_PID`" kill
> -9 `cat $CATALINA_PID` rm $CATALINA_PID else echo "Kill failed:
> \$CATALINA_PID not set" fi # fi
>
> I'm hoping to remove this completely during the modification. But
> I'd like to make a best effort attempt to understand why someone
> would have done this. Does anyone know of any common reasons, or,
> shall we say, valid reasons for making this modification?
If your webapp creates non-daemon threads, then the JVM might never
shut down.
You can find that out quite easily: just stop Tomcat in the usual way
(i.e. without using "kill" in that script) and see if the JVM process
completes after a few seconds (how long you should wait depends
entirely on how much work your webapp does on shutdown).
If it doesn't stop after a while, take a thread dump to see what
threads are still running. If there are any non-daemon threads
running, they'll be labelled as such and you can try to trace their
origin.
It might be that your server requires the use of 'kill' -- that would
be too bad. Of course, it would be better to use a script that calls
catalina.sh with the "-force" option instead of modifying the script
to ALWAYS force the shutdown. So, you can still use the upgraded
scripts and enable forcing shutdown if you want.
- -chris
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