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From Alessandro Vernet <>
Subject Re: [users@httpd] mod_proxy: ProxyPass max parameter has no effect
Date Thu, 15 Jul 2010 18:26:10 GMT

On Thu, Jul 15, 2010 at 10:53 AM, Jeff Trawick <> wrote:
> AFAIK the only thing you can do with prefork to avoid overrunning the
> backend is to set MaxClients no higher than the maximum number of
> backend connections.  But that's useless when you expect httpd to
> forward only a subset of requests to the backend.

And even if all the requests go to backend servers, that wouldn't
satisfy the requirement of "max per back-end server", MaxClients would
only be a "overall max". (I.e. if I have 4 back-end servers, and want
4 max concurrent connections per server, I could set MaxClients to 16,
but Apache could at some point in time send more than 4 concurrent
connection to a given back-end server.)

> Upcoming httpd 2.4 has loadable MPMs that can be switched out just
> like regular modules.  I hope that vendors provide 2-3 MPMs on Unix,
> with a switch as easy as changing the LoadModule directive and
> checking the default config for the new MPM.
> But yes, until then this may be a pain to change.

Then I'm looking forward to 2.4!

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