I'm writing a service that is having some preflight checking of the cluster spec done up front: #of master nodes == 1 #master-service and worker service must not co-exist
>From what I see, most services (implicitly) check this before the configure operation, as they look for where the NN is, JT is, or similar, usually implicitly and failing with a NoSuchElementException (e.g. WHIRR-652). I'm trying to be stricter and want to verify the template's validity before any VMs have been requested. This would fail-fast and save money. Is there a way to do this at present -and if so, how? -steve
