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

["John Merrells" <merrells@xxxxxxxxxxxx>]

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 possibly superceded by a clash from one or more other places.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.


>         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