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Load balancing with Apache, Tomcat or something else...

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Hello folks,

I search for a way to load balance between two or more Tomcat servers, based on the CPU load (memory load, etc.) of this servers.

Other question - Do you know ayn load balancer which comes with an API that I can use to tell which server is highly loaded and which not.

The background is, that our web application does also some calculation which can take a lot of time. The user triggers this calculations and will get the results by mail. The three balancing algorithms of Apache don't fit for this scenario.

Thank you all in advance!
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That's a good one. I have experience in load balancing, but that's on round robin or number of requests. It doesn't check if one such a request takes much longer than others.
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Actually, it sounds like it might be more appropriate in this particular case to have Tomcat pass the request to an external message queue handler such as JMS.
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