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Date: Tue, 26 Aug 2008 06:09:57 -0500
From: Jess Holle <jessh@ptc.com>
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To: Tomcat Developers List <dev@tomcat.apache.org>
Subject: Re: mod_proxy_balancer issue
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Mladen Turk wrote:
> Jess Holle wrote:
>> I want to use mod_proxy_balancer to load balance over a set of ports 
>> that potentially have Tomcats running on them.
>>
>> Unfortunately there will generally be a good number of ports where no 
>> Tomcat is running.  Every 'retry' seconds I have a request that takes 
>> about an extra second for each Tomcat-less port, which is not 
>> acceptable.
>>
>> Has there been any thought or effort to provide an option to retry 
>> dead/unresponsive members in a periodic background thread instead of 
>> with normal, "live" requests?  I am currently very interested in 
>> adding such an option if none exists, so I'd appreciate any thoughts 
>> on the matter.
> See the August thread on httpd-dev
> (Mpm maintenance thread hook) where I proposed
> exactly that. Among other things it will be
> potentially used with mod_proxy for out-of-the-request
> maintenance (Status checks, connection recycle, etc)
>
> No major objections, so I'm actively working on that.
> Also mod_jk in trunk has the watchdog thread
> (Apache 2+ only via JkWatchdogInterval) that allows
> to maintain the connection pool, and together with
> worker.xxx.connection_keepalive it can send CPING/CPONG
> packets on regular intervals thus checking the connection
> validity unbound from request frequency.
> My plan is to add this logic to mod_proxy, but using
> mpm hooks.
I am quite interested in any progress you make here.  Do you have any 
idea when you might have something testable in the mod_proxy area?

I'm quite willing to help, but you're clearly much more familiar with 
both mod_jk and APR/MPM than I am, so I suspect I'd just get in the way 
except at the testing level.

--
Jess Holle


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