mod_jk/2 load balance multiple tomcat servers problem 2004-01-21 - By Joe Aiello
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I have apache 2.0.43, Tomcat 4.1.24/Jboss 3.2.1 and using both mod_jk
1.2.5 and 2.02 (mod_jk/2 = seems to work the same on both 1.2 and 2.0).
-There is no tomcat on the apache server.
-I have 2 or more tomcat servers.
-Load balancing is working OK (as good as it mod_jk/2 balances).
- Tomcat is not clustered
Problem is when a worker leaves the network. If the worker is the first
one in the list things are much worse (especially for session less
requests). The mod_jk/2 tries a TCP connection to the first worker. It
appears to try several times 8, 10, not sure. We must wait for this TCP
connection to time-out before making a connection to the next worker.
It appears to mark the server in "failed" mode for 10 - 15 seconds. The
next request that comes in after that delay, mod_jk/2 tries to make the
send the request to the dead worker and the TCP connection must again
time-out before the worker is disabled for another 10 - 15 seconds.
Q.
- Is there a way to have mod_jk/2 keep the worker flagged as failed
until some sort of app-app message is successful?
- keep trying the TCP connection and keep the worker in flagged as
failed until the server responds to the TCP request (accepted or
rejected)?
- Is there some well known method to deal with a server that drops from
the network without manually removing the worker from the properties
file?
- Is there a way to change the length of time a server is considered
dead before sending a new connection to it?
- Another connector between Apache and Tomcat to use that does not
exhibit this behavior?
I have tried a large number of configuration changes for both mod_jk
1.2.x and 2.x as well as different mod_jk versions.
Thanks,
Joe Aiello
-- --Original Message-- --
From: Rick Szeto [mailto:rick.szeto@(protected)]
Sent: Wednesday, January 21, 2004 10:18 AM
To: Tomcat Users List
Subject: Quick context question.
Hi,
Does Tomcat 5 allow starting, stopping and/or restarting of a context
without affecting the other contexts of the same webapp? Also, can a
context be stopped or restarted gracefully(ie keep running until all of
the sessions are dead)?
Thanks,
Rick Szeto
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