My current application is designed for a single server configuration.
It uses a cron script to call a php file that does a nightly batch
process that takes as long as an hour or two.  It is run as a low
priority task so it doesn't incapacitate my system.

With scalr, I've been planning to set up the cron script on the mysql
master and submit the request to only one app server.  What I'm
wondering is how that would be interpreted and handled by ngix on the
www server.  Assuming that one app instance gets a very processing
intensive request, is the load balancer smart enough to launch one
additional instance, and then realize that launching additional
instances isn't necessary?  Will the www server then route traffic to
the server that is under-loaded and let the script server be while it
finishes?  Id' rather keep it as a single call to a single server than
to figure out a way to load distribute it.

I'm worried that scalr would keep launching instances to try to
offload the swamped server even though it is swamped from a single
request and not a traffic overload.



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