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From Jim Jagielski <...@jaguNET.com>
Subject Re: [users@httpd] Load Balancing question
Date Thu, 04 Aug 2011 15:30:15 GMT
Hence the reason for the rewrite in 2.3/2.4.

Balancer-manager in prev versions was NEVER intended for
long-term usage. The issue is in the interaction of balancer-manager
and mod_proxy_balancer, not the balancer itself.

On Aug 4, 2011, at 10:57 AM, Tom Evans wrote:

> On Thu, Aug 4, 2011 at 3:43 PM, Jim Jagielski <jim@jagunet.com> wrote:
>> 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.
>> 
>> 
> 
> No, it applies state randomly and indiscriminately. The first time
> this happened to us, one balancer cluster ended up with all backends
> enabled, when only one was before the graceful restart, and yet
> another had all backends disabled, when one should have been.
> 
> IE, it left the balancer members in a state where it was neither the
> configuration on disk, nor the configuration before restart. That is
> what I call broken - an entirely unpredictable state.
> 
> Given that load balancers are typically used to increase availability
> and reliability of a web service, a load balancer which consistently
> screws up the state is about as useful as an umbrella with holes in
> it.
> 
> Cheers
> 
> Tom
> 
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