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From Thomas Glanzmann <>
Subject Re: mod_jk taking a single tomcat-worker offline for softwaremaintenance
Date Mon, 21 Jan 2008 05:24:50 GMT

> No, the design of mod_jk is stateless w.r.t. sessions. There are only the 
> obvious solutions, i.e. assuming that after some time of disabling (time 
> depending on typical session use cases like 10 minutes or an hour) you stop 
> the worker and thereby redirect users that still try to use the node to 
> another node. They'll get an error of course and would need to relogin.

> Usually with some time of disable status you can reduce the number of 
> sessions, that will need to relogin and thus be disturbed by your 
> maintenance to about 5% (your mileage may vary).

> If you want to improve user experience more, you could include a 
> maintenance information in your app, like "Please logout and relogin during 
> the next hour because we have a maintenance scheduled starting at ...".

thank you a lot for the fast follow-up and the clarification of the
stateless architecture of mod_jk in case of session ids. I will continue
to do the obvious as you described it.


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