I like the concept... will review.
PS: Most patches should be against trunk. We fold into trunk,
test and only then propose for backport for 2.2.x
On May 23, 2011, at 3:10 PM, Keith Mashinter wrote:
> I've added a patch to the proxy/balancer to allow for route-only workers are
> only enabled for sticky session routes, allowing for an even more graceful
> fade-out of a server than making its lbfactor=1 compared to lbfactor=100 for
> others.
>
> Please reply/vote if you also think it's useful.
>
> https://issues.apache.org/bugzilla/show_bug.cgi?id=51247
> This enhancement, actually SVN Patched against 2.2.19, provides a worker
> status
> flag to set a proxy worker as only accepting requests with sticky session
> routes, e.g. only accept requests with a .route such as Cookie
> JSESSIONID=xxx.tc2.
>
> This allows for a graceful fade-out of servers when their sessions are
> removed;
> they continue to receive requests for their sticky session routes but are
> passed over for requests with no specified route, just as if they were
> disabled. In other words, route-only workers are only enabled for sticky
> session routes.
>
> Intended use (Tomcat JSESSIONID noted here but could be PHPSESSIONID, Ruby
> _session_id, or anything with cookie or request-parameter based session ids):
> 1. An Apache rev-proxy running for multiple Tomcats.
> 2. To fade-out a Tomcat for maintenance, set route-only enabled in
> the
>
> balancer-manager or reload the configuration with the worker status +R.
> (This depends on Tomcat web-apps delete session cookies, see further below.)
> 3. Check on the balancer-manager or its Tomcat worker even a few minutes /
> hours, and when it seems to have completed old sessions you can mark it fully
> disabled.
> 4. Once done maintenance, you can then set route-only disabled (status -R) and
> fully enable the worker again.
>
> To delete a JSESSIONID Cookie from a Servlet, you need to specify the same
> Domain and Path as the original Cookie and setMaxAge=0 as in the typical
> example below but you should check on your own Domain and Path when a Cookie
> is
> created, e.g. watch the Cookie headers in Firefox Firebug.
>
> // To delete a Cookie setMaxAge(0) and also any original domain and path
> if
> specified.
> Cookie ck = new
> Cookie("JSESSIONID", null);
>
> //ck.setDomain("");
> ck.setPath(request.getContextPath());
> ck.setMaxAge(0);
> response.addCookie(ck);
>
> \|/- Keith Mashinter
> [email protected]
