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Re: Load balancing and load determination

On 05/11/2018 15:05, Jim Jagielski wrote:
> I was thinking about something more robust and usable than heartbeat (due to multicast) but similar in basic concept.

I remember trying mod_heartmonitor with a simple listener like
<Listener className="org.apache.catalina.ha.backend.HeartbeatListener"
Port="8009" ProxyList="" />

Where ProxyList is the lit of httpd that are able to proxy to tomcat
back-ends. See I guess I need to
revisit that to use mod_prxy_balancer logic.

>> 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