RE: should one single search be able to encompass several databases?

["Howard Chu" <hyc@highlandsun.com>]

That's exactly the idea I proposed before. I've gone quite a ways into
implementing this approach in an older snapshot. I also modified the calling
sequence a little, throwing the common parameters into a structure so they
could be passed around more easily. Functions with 5+ arguments really
bother me...

There's an issue that I haven't quite resolved in my mind: when you chain
multiple backends, and one of them has an error and is unable to fulfill a
search request, but the others are able to provide results, what kind of
error indication do you send back to the client? I found that just sending
the error code of the single failure along with the results wouldn't work
very well, the client tended to ignore all the valid results depending on
the error code.

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

> -----Original Message-----
> From: owner-openldap-devel@OpenLDAP.org
> [mailto:owner-openldap-devel@OpenLDAP.org]On Behalf Of Kurt D. Zeilenga
> Sent: Thursday, July 19, 2001 10:11 AM
> To: Stig Venaas
> Cc: openldap-devel@OpenLDAP.org
> Subject: Re: should one single search be able to encompass several
> databases?
>
>
> I'd like to see the backend API changed to support "virtual" directory
> and "chaining".   Basically, the API needs to be changed so that
> instead of the backend calling various send response calls as needed,
> the backend uses callbacks to provide the response information to the
> caller.  Then we can write a backend which "chains" between backends...
> and a backend which does "virtual" directory stuff... and all kinds
> of fun stuff.
>
> It shouldn't be too hard to implement...
>
> Kurt
>