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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