Re: [ldapext] nfsv4 vs the ldap consistency model

[Kurt Zeilenga <Kurt.Zeilenga@Isode.com>]

On Nov 21, 2008, at 12:38 PM, Leif Johansson wrote:

> So I had a talk with the nfsv4 wg today (and on their list earlier).  
> The are
> trying to build AFS-style volume location for NFS using LDAP and I  
> think they
> may have a problem with the LDAP consistency model: i.e "eventually
> consistent" for a couple of their usecases.
>
> I won't go into details unless people particularly care but I think  
> we may
> need an I-D (something for a bof in SF perhaps) describing a control  
> which
> asks for the result of an update operation to be  delayed until a  
> certain
> criterion (eg in the form of a compare condition) is fulfilled on all
> "slaves". Implementation details would differ depending on the precise
> way replication is done for that vendor.
>
> Does that sound like something you would
>
> a) barf at
> b) laugh at
> c) ignore
> d) review given that someone wrote it up?

At present, I'm kind of at b).

But I don't see how that changes the replication consistency.  In  
particular, replication of the data for which the condition depends  
upon would still only eventually consistent.

If what they are after is transactional consistency, there may be  
existing LDAP implementations which provide this.  I recall something  
be presented in this area at LDAPcon.

-- Kurt
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