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Re: question about the meta backend

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