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From Jeff Trawick <traw...@gmail.com>
Subject Re: svn commit: r1000130 - /httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml
Date Wed, 22 Sep 2010 18:59:02 GMT
On Wed, Sep 22, 2010 at 2:37 PM, <trawick@apache.org> wrote:

> Author: trawick
> Date: Wed Sep 22 18:37:16 2010
> New Revision: 1000130
>
> URL: http://svn.apache.org/viewvc?rev=1000130&view=rev
> Log:
> follow up r956069 with additional clarifications
> about the connection pool and related parameters
> (yes, and fix part of those earlier "clarifications")
>
> Modified:
>    httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml
>
> Modified: httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml
> URL:
> http://svn.apache.org/viewvc/httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml?rev=1000130&r1=1000129&r2=1000130&view=diff
>
> ==============================================================================
> --- httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml (original)
> +++ httpd/httpd/trunk/docs/manual/mod/mod_proxy.xml Wed Sep 22 18:37:16
> 2010
> @@ -764,13 +764,12 @@ expressions</description>
>     using  <code>key=value</code> parameters, described in the table
>     below.</p>
>
> -    <p>Setting <code>min</code> will determine how many connections
to
> -    the backend server will be retained after use.  Up to the
> -    Soft Maximum, or <code>smax</code>, number of connections will be
> -    created on demand.  Any connections above <code>smax</code> are
> -    subject to a time to live, or <code>ttl</code>.  Apache httpd will
> -    never create more than the Hard Maximum or, <code>max</code>,
> -    connections to the backend server.</p>
> +    <p>Setting <code>min</code> to non-zero allows connections to
the
> +    backend server to be retained after use;


That last sentence is wrong, isn't it?  (I'm using the
two-steps-forward/one-step-back approach until I can't go any further.  At
least you don't have to look at the doc for apr_reslist_create() anymore ;)
)

I honestly don't know what min is used for since we only create connections
on demand, unless min=0 means don't retain, and min>0 means retain.

What I want to do as a user today: retain connections but don't use any if
they've been idle for >= origin-server-keepalive seconds.

ttl is the only timeout avail, so that has to be set to the origin's
keepalive timeout
ttl only applies to connections above smax, so smax needs to be set as low
as allowable

so perhaps

ProxyPass / http://xxx/   ttl=5  smax={0,1,whatever it will accept}

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