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List:       openldap-software
Subject:    Re: question about the meta backend
From:       Howard Chu <hyc () symas ! com>
Date:       2005-04-29 17:07:48
Message-ID: 427269E4.6040104 () symas ! com
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Pierangelo Masarati wrote:

>>Can it be told to merge all of the objects
>>with the same dn
>>into one object containing the attributes of all?
>>    
>>
>No.  In principle, you could design a layer that does this; the
>translucent overlay does something similar; the point is that to be able
>to do it consistently for distributed systems, all search results should
>be temporarily stored and merged until the very end before any results can
>be returned.  Another issue is that write operations would be very
>difficult, since back-meta should know how to split attributes and values
>among the targets.  Of course one can figure out many ways to do it, but
>it would get very implementation specific.
>  
>
We will soon be extending the translucent overlay to allow configuring a 
list of "local" attributes. This would allow more intelligent processing 
of e.g. search filters (currently a search is sent to the remote server 
unmodified; if the filter references attributes that are not known to 
the remote server, the filter usually results in Undefined.)

A similar approach could be taken in back-meta, where attribute 
affinities are defined for each target, with options to merge or replace 
on a per-attribute basis. This way you could designate that "writes to 
Attribute foo always go to target bar" and so on.

-- 
  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support

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