Hello,
We have a large number of tomcats (5.5.26) on serveral servers. These tomcats
communicate with a apache httpd on the same server using mod_jk (1.2.26). They
all work fine until I restart apache httpd. Then randomly and certainly not all
the time a tomcat stops working. Seeing the time the tomcat shuts down matches
the time apache was restarted it seems to lead to the conclusion that the two
events are related. For that reason I have patched my tomcats to be able so see
with it's being stopped.
I have changed (source 1.2.26)
container/catalina/src/share/org/apache/catalina/core/StandardService.java
On line 483 I have added a:
Thread.dumpStack();
This gives me the following in the catalina.out during a httpd restart:
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Thread.java:1158)
at
org.apache.catalina.core.StandardService.stop(StandardService.java:483)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:602)
at
org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:645)
Apr 1, 2009 12:05:16 AM org.apache.catalina.core.StandardService stop
INFO: Stopping service WebManager
Apr 1, 2009 12:05:16 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 4 instance(s) to be deallocated
Apr 1, 2009 12:05:17 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 4 instance(s) to be deallocated
Apr 1, 2009 12:05:18 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 4 instance(s) to be deallocated
What could be the reason the ShutdownHook is called? The apache restart happens
thru a "kill -HUP" on the apache httpd main PID. So no signals should be sent
to tomcat.
With regards,
Leon
--
Leon Brouwers
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