[cgl_discussion] Re: [OCF]draft 0.8 of the SAF Application Interface specification

Mika Kukkonen mika at osdl.org
Mon Jan 13 10:36:06 PST 2003


I find myself completely agreeing with what you have written below.
I guess we should take it as an encouraging omen for next weeks big
F2F discussions :-).


On ma, 2003-01-13 at 03:45, Lars Marowsky-Bree wrote:
> On 2003-01-10T09:34:41,
>    Joe DiMartino <joe at osdl.org> said:
> > The first two drafts and the most recent draft of the OCF event service
> > use an opaque object that can be converted into a file descriptor.  We
> > DO assume that the underlying OS has a mechanism similar to poll/select.
> I think - for the target audience of OCF - assuming basic POSIX compliance is
> probably safe, maybe we could even assume suv3, but indeed not as readily.
> I think _without_ making _some_ assumptions - like POSIX - the standard would
> become an unwieldly complicated beast with three heads. Now, a clustering
> standard is always going to be a complicated beast, but I think we can do with
> 2 heads ;-)
> > I think it was understood, if not explicitly stated, that OCF would use
> > the openDLM in its full glory, complete with lock conversion and async
> > notification of blocked lock requests.  At least that was my plan.
> I think this has indeed been our plan; I'm in full agreement here.
> Watering down the DLM makes it less useful; I am all for 'Keep it simple,
> stupid!', but there is such a thing as _needed_ complexity. I think it is safe
> to assume that any DLM which can't support a database and a CFS is not
> powerful enough and will lead to people bringing their own DLM again - in
> which case the point of standarizing an API is kinda lost.
> At least the specification must allow the advanced features, even if they may
> not be implemented everywhere - an application could then just bail out at
> startup if it doesn't find the required features.
> > Any attempt to water it down seems naive. 
> Agreed.
> Sincerely,
>     Lars Marowsky-Brée <lmb at suse.de>
> -- 
> Principal Squirrel 
> SuSE Labs - Research & Development, SuSE Linux AG
> "If anything can go wrong, it will." "Chance favors the prepared (mind)."
>   -- Capt. Edward A. Murphy            -- Louis Pasteur

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