Re: (ITS#5534) Samba4 needs internal transactions/consistancy

Thursday, 29 May 2008

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On Wed, 2008-05-28 at 08:14 -0700, Howard Chu wrote:
...
 Andrew Bartlett wrote:
 > On Tue, 2008-05-27 at 18:43 -0700, Howard Chu wrote:
 >> Andrew Bartlett wrote:
 >>> On Tue, 2008-05-27 at 18:22 -0700, Howard Chu wrote:
 >>>>> This needs to occur even between databases on the server, but I won=
't ask that
...
 >>>>> it occur outside the known trees.
 >>>> It's already possible for operations in one database to reference
en= tries in a
...
 >>>> different database, so that aspect of validation
should be fine. How= ever, as
...
 >>>> noted before, "validation" is generally
bogus to begin with. In part= icular,
...
 >>>> how do you create entries with circular references?
If you disallow = references
...
 >>>> to nonexistent entries, you can't set the
references until after all=  of the
...
 >>>> entries have been created. This means that you
cannot backup a datab= ase that
...
 >>>> has these references and then later reload it in a
single pass.
 >>> An interesting point, but I need to match the windows runtime
 >>> behaviour.
 >> Only when it has a visible impact on other clients. What software will= 
break
...
 >> if the directory allows you to add new entries that contain
dangling
 >> references? What will break if the directory allows you to modify a re=
ference
...
 >> attribute to point to a nonexistent entry?
 >
 > Sure, I'm not asking for a change to default behaviours.  I'm listing
 > the things that our testsuite finds are differences, and looking for
 > solutions.
=20
 I don't believe your proposed solution will ever be satisfactory. Entries= 
with=20
...
 circular references will also break syncrepl Refresh if the
constraint yo= u're=20
...
 asking for is enforced.=20 
Only if you don't consider them in replication.  If the backlinks are
added on each node, and not replicated, then surely you just need to
import a set of replicated data, and then in the same transaction update
the links.=20

Is there perhaps another way to implement this - say using a
search-based virtual attribute for one half of the problem?

I'm in no position to set your priorities, and my wishlist remains only
that I hope to someday be able to make this work with OpenLDAP, but
these issues remain.

Andrew Bartlett

--=20
Andrew Bartlett
http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Red Hat Inc.

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