RE: Comments on ldup-replica-req-00.txt

[Alan Lloyd <Alan.Lloyd@xxxxxxxxxxxxxxxxxxxx>]

> -----Original Message-----
> From:	Russel Weiser [SMTP:RWEISER@xxxxxxxxxx]
> Sent:	Friday, April 24, 1998 2:01 AM
> To:	owner-ietf-ldup@xxxxxxx; merrells@xxxxxxxxxxxx;
> Alan.Lloyd@xxxxxxxxxxxxxxxxxxxx
> Cc:	ietf-ldup@xxxxxxx; USRINIVA@xxxxxxxxxxxxx
> Subject:	Re: Comments on ldup-replica-req-00.txt
> 
> 
> 
> >>> "John Merrells" <merrells@xxxxxxxxxxxx> 04/21 5:53 PM >>>
> Alan Lloyd wrote:
> 
> > [snip...icl anecdote]
> 
> >         And I shudder to think that every time an attribute is
> updated,
> > I would have to broadcast over [to] the replicated system,  the DN,
> the
> > attribute type.value and its tag so that it could be verified and
> > possibly superceded by a clash from one or more other places.
> 
> Each operation will require a different set of items to be
> transferredbetween servers. They'll always be a Unique Identifier for
> the entry,
> this is more likely to be a UUID than a DN.  If it's a modify, as you
> suggest, then the attribute identifier and value must be sent.  The
> final piece of information required will be something to aid the
> conflict detection and resolution policy you decide to deploy.
> 
> >         what about time zones, transit delays, system clock
> resolution.
> 
> You don't have to use time in your conflict detection and
> resolutionpolicy.  You could choose something else.  Like the
> attribute versioning
> which we've just mentioned.
> (RFW)   John I may have missed something in the Email thread where
> versioning has been shown to work...  If I have three servers that the
> replicating then on two of the servers an attribute is modified 2
> different clients differently How would you suggest versioning work
> and resolve to the 
> third server?????
> 
	As said - how do deletes and renames work with versions - as
said been there done that - a good clock source is needed - trust me -
ex ICL :-)
	regards alan

> Cheers 
> RFW
> >         Distributed - high performance DSAs seem a lot less effort
> and
> > less problematic -
> 
> Lovely, but customers are asking for replicated directory services.
> 
> John
> 
> 
> 
> >         I wonder who can supply those :-)
> >
> >         regards alan
> > > -Uppili Srinivasan
> > >
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> > >
> > >
> > >
> > >  << File: ATT00115.ATT >>  << Message: Re: Comments on
> > > ldup-replica-req-00.txt >>
> 
> 
> 
> --
> John Merrells
> Netscape Communications
> Directory Server
> Software Engineer
> 
> http://people.netscape.com/merrells 
> 
>