tdb transaction nesting and ctdb

[Volker Lendecke]

On Mon, Jun 15, 2009 at 10:56:04AM -0400, simo wrote:
> On Mon, 2009-06-15 at 14:59 +1000, tridge at samba.org wrote:
> > > Did you get Tridge's opinion on this? Is this going into the
> >  > main Samba tdb code any time soon?
> > 
> > I think it's a good idea, we just need to make sure we set the "allow
> > nesting" flag on all the existing users that need it.
> 
> I am a bit unclear in what circumstances nesting transactions (as
> implemented) is useful ?

It's useful when initializing the s3 registry.tdb on a busy
server. This takes *ages* because we have so many fsync
calls. The enclosing transaction makes this a single set of
fsync/msync calls which is a lot faster.

Volker
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