Re: [ldapext] Requesting mailing list feedback for draft-dawkins-ldapext-subnot

[Howard Chu <hyc@highlandsun.com>]

Spencer Dawkins wrote:
> Hi, LDAPEXT Mailing list,
>
> Some of you may be aware of a 3GPP CT4 proposal to add a subscribe/notify
> capability to LDAP. CT4 would like to use LDAP as the directory building
> block for "User Data Convergence", but the service description for this
> service includes asynchronous notifications about changes - so CT4 is
> exploring extending LDAP to provide subscribe/notify to support this UDC
> requirement.
>
> I've been helping Xun Peng with a draft describing this extension, and
> Alexey is trying to determine whether this draft is appropriate for him to
> AD-sponsor. He pointed me to the LDAP Directorate, and we've gotten some
> helpful comments from them on the version 00 version of the draft. Kurt
> suggested that I post a revised draft to this mailing list, requesting your
> feedback.
>
> The revised draft is available as
> http://www.ietf.org/id/draft-dawkins-ldapext-subnot-01.txt.
>
> We don't think the draft is perfect, and we're interested in any suggestions
> you may have for things we've missed. This is NOT a "must be accepted with
> no changes" Internet-Draft :D
>
> The critical questions are
>
> - whether the draft is an appropriate proposal for Alexey to AD-sponsor, and
>
> - whether the draft is "close enough" to complete to allow it to be approved
> in the 3GPP Release 9 timeframe.
>
> I am subscribed to this mailing list and will see your responses.

I'm rather puzzled by this proposal; I don't see anything in it that isn't 
already accomplished using RFC4533. In your section 6 "Differences from 
Existing LDAP Sync Extensions" discussion I'm not really convinced of any of 
these points.

1) The only association between a client and a server is via an active LDAP 
session, so I don't understand this point.

2) OpenLDAP's implementation has no limitations as implied here. E.g. using 
delta-syncrepl you can already filter on exactly which types of changes you 
want to see.

3) I'm not sure this is true either. A client can send a ContentSync request 
with an empty cookie and reloadHint TRUE to obtain the current state of the 
server, then reissue a refreshAndPersist request with this cookie to proceed 
from there. There's no need to return all the data up front.

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/
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