> I don't suppose you could restructure things so that only the module is
> needed. The upstream-fair patch seems to get away without having to
> patch nginx source.

I don't think it is possible to achieve the request queuing
functionality without modifying Nginx's source. The patch is a small
change and does not affect how other modules work - it would be nice
if it could be merged.

Igor:
http://github.com/ry/nginx-ey-balancer/blob/afccd5c15e10257e675fb56715dd7d63bfcf4ffc/patches/nginx-0.6.34.patch
It adds a new return value, NGX_BUSY, for the peer.init() callback in
upstream modules. In the case of this, the module can itself decide to
when to call ngx_http_upstream_connect() - until then the request
hangs.