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From Jess Holle <>
Subject Re: mod_proxy_balancer issue
Date Wed, 27 Aug 2008 20:48:35 GMT
Jess Holle wrote:
> Mladen Turk wrote:
>> Jess Holle wrote:
>>> Mladen Turk wrote:
>>> Is there a means of achieving background-only (or nearly so) testing 
>>> of dead workers with mod_jk?  That's what I'm looking for in both jk 
>>> and mod_proxy_ajp connectors.  I guess I was hoping/assuming it was 
>>> there in mod_jk from reading the docs.
>> There is in the mod_jk (SVN trunk).
I've been reading this code now...

The watchdog thread looks very useful.  If I understand it correctly, 
the watchdog thread can do whatever it feels like but currently mainly 
calls wc_maintain, which will only do work at most every worker.maintain 
seconds, right?

connection_keepalive does not look like it really my bill, though.  I'm 
most worried about workers in an error state and ensuring that they are 
rechecked every recover_wait_time -- but only by the watchdog thread and 
ideally via a ping/pong.  Currently recover_workers appears to just put 
workers into a recovery state where they'll be elligible to be tried 
again on a future request -- without checking whether the worker is 
actually accessible.  That's fine for some use cases, but explicitly 
what I want to avoid.

Are there any thoughts to have an option to have recover_workers() do a 
ping prior to returning a working to a non-error state?

And, yes, a watchdog thread in mod_proxy_balancer /and /a reasonable 
means of balancer invoking a ping via mod_proxy_ajp would be really 
helpful as far as mod_proxy_ajp is concerned.

Jess Holle

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