Re: Meta backend

[Pierangelo Masarati <ando@sys-net.it>]

Andrew Graham wrote:

> Some questions about the back-meta...
>
> 1.
>
> According to ITS 3785, any filter that cannot be successfully parsed is
> rewritten to include "(!(objectClass=*))" before being propagated to any
> target, always producing an empty result. My problem is that one of my
> target servers throws a wobbly when it receives a query with this
> filter, and takes around 15 seconds to respond with the empty result. Is
> there any way of circumventing this behaviour?

You could try the "t-f-support" statement; it makes slapd-meta(5) use an 
"absolute false" (RFC 4526) filter "(|)".  You should check whether the 
remote server(s) support(s) it.  As an alternative, invalid filters 
could be ignored, but this is not possible right now.  You could submit 
a feature request (via the ITS <http://www.openldap.org/its/>).

> 2.
>
> Two of the target servers return search references for every query. As
> these are of no use in this application, is there some way to stop
> openldap from returning these references to the client?

No.  As this functionality might be generally useful, feel free to 
submit a feature request via the ITS.

> 3.
>
> Just out of interest, are there any plans to enable dynamic config
> functionality for back-meta?

Well, there are some; however, a couple of issues currently prevent me 
from working at it: the configuration is rather involved compared to 
other backends, and it might require the use of a configuration subtree 
rather than just one entry.  Furthermore, features like the possibility 
to run-time modifying the number of targets and their order seems to 
require significant reworking of slapd-meta internals, which means a lot 
of effort.  As such, it is unlikely that I (or SysNet) undertake this 
without some sponsorship.  Of course, patches are welcome as usual.

p.


Ing. Pierangelo Masarati
OpenLDAP Core Team

SysNet s.r.l.
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