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

[abartlet@samba.org]

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On Tue, 2008-05-27 at 18:22 -0700, Howard Chu wrote:
> abartlet@samba.org wrote:
> > Full_Name: Andrew Bartlett
> > Version: CVS HEAD
> > OS: Fedora 9
> > URL: http://www.openldap.org/lists/openldap-technical/200803/msg00101.h=
tml
> > Submission from: (NULL) (59.167.251.137)
> >
> >
> > For Samba4, I need a few things, detailed in the attached URL.
>=20
> The above message thread had some unanswered questions. We may need to ha=
ve=20
> each point listed out again.
>=20
> > This ITS is for internal transactions and validation - the ability to h=
ave a
> > openldap overlay roll back all the changes so far, because a preconditi=
on is not
> > met.
>=20
> I think this one is understood, OK. Just a matter of getting the time to =
do it.
>=20
> > I need the memberOf and refint modules to ensure that no dangling links=
 ever
> > exist, even over subtree renames and invalid modifies, and that a trans=
action
> > ensures this is always the case.
>=20
> I think the proper use of memberOf still needs to be addressed. E.g., it'=
s=20
> generally a bad idea to search for (memberOf=3Dfoo) when you can simply=20
> enumerate the members inside the "foo" entry. If you give us precise exam=
ples=20
> of the searches and modifications that you'll be using, we may be able to=
=20
> narrow the scope of this work.

I'll be passing on any search that a windows client makes, and trying to
return the same result a windows server would return.  Bad ideas still
have to be implemented in my world :-(

> > This needs to occur even between databases on the server, but I won't a=
sk that
> > it occur outside the known trees.
>=20
> It's already possible for operations in one database to reference entries=
 in a=20
> different database, so that aspect of validation should be fine. However,=
 as=20
> noted before, "validation" is generally bogus to begin with. In particula=
r,=20
> how do you create entries with circular references? If you disallow refer=
ences=20
> to nonexistent entries, you can't set the references until after all of t=
he=20
> entries have been created. This means that you cannot backup a database t=
hat=20
> has these references and then later reload it in a single pass.

An interesting point, but I need to match the windows runtime
behaviour.=20

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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