Server Role States

[Simo Sorce]

On Thu, 2014-06-12 at 10:01 -0400, Stephen Gallagher wrote:
> On 06/11/2014 10:15 PM, Simo Sorce wrote:
> > On Tue, 2014-06-10 at 10:20 -0400, Stephen Gallagher wrote:
> >> Thomas Woerner, Miloslav Trmač and I had a long discussion the
> >> other day about how to handle states in the Role API. We came up
> >> with the following approach:
> >> 
> >> Persistent States: Nascent[1] (We know about the Role but have
> >> not attempted to deploy it) ReadyToStart (It has been installed
> >> and configured but is not running) Running (Self-explanatory) 
> >> Error (Something has gone wrong and needs to be corrected to
> >> return the system to ReadyToStart[2])
> >> 
> >> Transitional States (used to indicate that other clients should
> >> not interfere): Deploying Decommissioning Starting Stopping
> >> 
> >> I've attached a graphviz document and a rendered PNG of the
> >> state diagram to hopefully make it clear. Comments and feedback
> >> welcome, but our intent is to be off and implementing before the
> >> end of the week.
> >> 
> >> 
> >> [1] While we were discussing this, we had "Known, not deployed"
> >> as a placeholder here. I think "nascent" covers this elegantly,
> >> but if others have a better idea, the name is not set in stone.
> > 
> > I find it hard to grok 'Nascent', aren't 'Available' or
> > 'Deployable' better terms ?
> 
> I didn't like "Available" because to me it implies something similar
> to ReadyToStart. Deployable is an option.
> 
> I picked nascent because of its definition:
> "adj. just coming into existence and beginning to display signs of
> future potential"
> This seemed like *exactly* what this state is.
> 
> 
> > Also ReadyToStart sound a bit long on my tongue, why not just 
> > 'Deployed', or even simply 'Ready' ? Otherwise if ReadyToStart is
> > good, why not also ReadyToDeploy (instead of Nascent).
> > 
> 
> "Ready" implies to me that some action has already been taken.
> 
> > Sorry to bikeshed :/
> > 
> 
> Ultimately, these are just terms and will be documented with their
> full meanings, so as long as they meet the "good enough" metric, let's
> not waste much more time on them.

I just dislike Nascent with a passion, I do not care much for
ReadyToStart but it is the only state that is a composed of multiple
words.

Simo.

-- 
Simo Sorce * Red Hat, Inc * New York