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From Jim Jagielski <...@jaguNET.com>
Subject Re: [users@httpd] Load Balancing question
Date Thu, 04 Aug 2011 14:43:53 GMT

On Aug 4, 2011, at 7:40 AM, Tom Evans wrote:

> On Thu, Aug 4, 2011 at 2:14 AM, Jeff Poling <jpoling@moody.edu> wrote:
>> Thanks.  For whatever reason, an apachectl stop and an apachectl start corrected
the issue- the balancer-manager now reflects the config in the config file
>> 
> 
> mod_proxy_balancer is dangerous to use when doing graceful restarts.
> The state of the balancers is saved, and then re-applied, however
> various things can cause the settings to be applied to a different
> balancer member.
> 
> This is a long standing bug, and hence (I presume) quite hard to fix.
> These bug reports describe it
> 
> https://issues.apache.org/bugzilla/show_bug.cgi?id=44736
> https://issues.apache.org/bugzilla/show_bug.cgi?id=45950
> 
> The only solutions are:
> 
> 1) Don't use mod_proxy_balancer. Proxy to a local instance of ha-proxy
> or varnish running on localhost, and use that to manage your backends
> or
> 2) Don't use graceful restarts.
> 
> Both suck. You'll see the bug dates back over 3 years, and there is no
> intention to fix it as far as I know. At $JOB, we're stopping using
> mod_proxy_balancer now, we're slowly migrating each balancer to
> ha-proxy.
> 

You will note that the balancer in 2.3/2.4 resolves this issue.

BTW, the idea that mod_proxy_balancer is "broken" only means that
it does not do what you expect, which is restore all local mods
made via balancer_manager, but this was never guaranteed.


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