I use Apache 1.3.27 connected to Tomcat 4.1.12 with mod_jk, using ajp13. When I restart Tomcat, if someone tries to access a jsp/servlet from Apache, he gets an error message from Apache ("Internal Server Error - The server encountered an internal error or misconfiguration and was unable to complete your request.") until Tomcat has finished restarting.
Is there a way to tell mod_jk to wait until Tomcat has finished restarting (retry connecting to the tomcat ajp port until it responds or until a certain timeout) and then serve the request? If that's not possible, can I display a different error message than the default? (I don't want to use the apache ErrorDocument directive because that would hide other unexpected errors too and give a misleading message)
Another solution I considered is to use jk's load balancing:
- Two tomcat servers with identical configuration (except port numbers) would run simultenaously on the same machine
- When I need to restart tomcat (configuration change, new virtual host added), I would first restart only the first tomcat server (all requests would then be sent to the second server by mod_jk), and when the first one finishes starting, restart the second one
Has anyone done something similar to this? Do you think it's a good idea or would I just be wasting memory/cpu time?
Thanks
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