[Engine-devel] default config value (vdc_options; general)

[Mike Kolesnik]

----- Original Message -----
> 
> 
> ----- Original Message -----
> > From: "Doron Fediuck" <dfediuck at redhat.com>
> > To: "Alon Bar-Lev" <alonbl at redhat.com>
> > Cc: "engine-devel" <engine-devel at ovirt.org>, "Gilad Chaplik"
> > <gchaplik at redhat.com>
> > Sent: Monday, December 3, 2012 2:32:55 PM
> > Subject: Re: [Engine-devel] default config value (vdc_options;
> > general)
> > 
> > ----- Original Message -----
> > > From: "Alon Bar-Lev" <alonbl at redhat.com>
> > > To: "Gilad Chaplik" <gchaplik at redhat.com>
> > > Cc: "engine-devel" <engine-devel at ovirt.org>
> > > Sent: Monday, December 3, 2012 12:19:53 PM
> > > Subject: Re: [Engine-devel] default config value (vdc_options;
> > > general)
> > > 
> > > 
> > > 
> > > ----- Original Message -----
> > > > From: "Gilad Chaplik" <gchaplik at redhat.com>
> > > > To: "engine-devel" <engine-devel at ovirt.org>
> > > > Sent: Monday, December 3, 2012 12:16:11 PM
> > > > Subject: [Engine-devel] default config value (vdc_options;
> > > > general)
> > > > 
> > > > hi all,
> > > > 
> > > > In engine config table (vdc_options), when an option has a
> > > > general
> > > > as
> > > > its version, and we fetch by version,
> > > > we aren't getting the general value, rather the default one
> > > > (hard
> > > > coded in the config value enum)
> > > > 
> > > > Is this the wanted behavior and why?
> > > > According to it general is some-kind of a version number
> > > > instead
> > > > of
> > > > a
> > > > configurable fallback to a missing version.
> > > > 
> > > > NOTE: currently there isn't any configurable default; in case
> > > > the
> > > > hard coded default != your configurable default,
> > > > you need to specify it for each version.
> > > > 
> > > > I will be glad to fix it.
> > > > 
> > > > Thanks,
> > > > Gilad.
> > > 
> > > I am about to rewrite this whole configuration subsystem.
> > > 
> > > Defaults will not be stored in database nor in code.
> > > There will be default per version.
> > > 
> > > Regards,
> > > Alon.
> > 
> > Please explain 'default per version';
> > 
> > - Can you have more than one configuration for the same version?
> 
> No, nothing will be changed, you will have one default per version
> with fallback to the generic version default.
> 
> > - What happens if I need a general configuration which isn't
> > relevant
> > for a specific version?
> 
> You will get the default of the generic version.
> 

I think it would be wise to check out http://commons.apache.org/configuration/ if re-evaluating the current configuration system.

> Alon.
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