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Re: Load balancing and load determination


I was thinking about something more robust and usable than heartbeat (due to multicast) but similar in basic concept.

> On Nov 5, 2018, at 8:48 AM, jean-frederic clere <jfclere@xxxxxxxxx> wrote:
> 
> On 30/10/2018 13:53, Jim Jagielski wrote:
>> As some of you know, one of my passions and area of focus is
>> on the use of Apache httpd as a reverse proxy and, as such, load
>> balancing, failover, etc are of vital interest to me.
>> 
>> One topic which I have mulling over, off and on, has been the
>> idea of some sort of universal load number, that could be used
>> and agreed upon by web servers. Right now, the reverse proxy
>> "guesses" the load on the backend servers which is OK, and
>> works well enough, but it would be great if it actually "knew"
>> the current loads on those servers. I already have code that
>> shares basic architectural info, such as number of CPUs, available
>> memory, loadavg, etc which can help, of course, but again, all
>> this info can be used to *infer* the current status of those backend
>> servers; it doesn't really provide what the current load actually
>> *is*.
>> 
>> So I was thinking maybe some sort of small, simple and "fast"
>> benchmark which could be run by the backends as part of their
>> "status" update to the front-end reverse proxy server... something
>> that shows general capability at that point in time, like Hanoi or
>> something similar. Or maybe some hash function. Some simple code
>> that could be used to create that "universal" load number.
>> 
>> Thoughts? Ideas? Comments? Suggestions? :)
> 
> having the back-ends to provide the load they are able to handle
> lbfactor (via w_lf or somethere similar. That requires the back-ends to
> be able to send request to httpd balancer-manager handler.
> 
>> 
> 
> 
> -- 
> Cheers
> 
> Jean-Frederic