> On Nov 27, 2018, at 8:33 PM, Daniel Ruggeri <> wrote:
> Hi, Jim;
> I'm coming up empty on a search against the Google-machine for SURVEY 
> protocol. Any pointers you can share?
> I'm also curious what your thoughts are about dealing with growth of the 
> worker pool beyond the control of the proxy admin. For example, if I 
> configure a balancer for 10 nodes, I have an idea of tuning parameters I 
> might set differently than if the number of backends is in the tens of 
> servers.

Since nanomsg/nng will provide the communication between httpd and the 
backends, we could add something like a CONFIG survey that allows for the 
backends to "suggest" params.

> -- 
> Daniel Ruggeri
> On November 27, 2018 5:23:25 AM CST, Jim Jagielski <> wrote:
> In the coming week or so, I will be committing my load balance,
> load determination and discovery work to a sandbox trunk. Many
> people have asked for more info, so here we go.
> Basically, this new feature uses nanomsg (nng) to implement the
> SURVEY protocol between workers (nodes) and the front end server.
> The proxy server will send out MEMBERSHIP and STATUS surveys, that
> nodes can respond to; thus new nodes can automagically add themselves
> as they come up as well as remove themselves when they restart or
> shutdown via MEMBERSHIP. STATUS can be used to provide real-time
> load on each node, which will be sent via a __packed__ struct,
> ala NTP and other common usage patterns, in which 32bit fields are
> converted from endian-ness to network and back. That STATUS info can
> be used for "intelligent" load balancing and will provide some
> typical server metrics such as memory, # of cpus, etc...

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