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Subject: RE: F2f meeting

The intent at the meeting was to emphasize that BTP can be used to
coordinate web services. The specific example that was taken out was
possibly incorrect but that is just incidental. What we agreed to is to

- change the wording on the existing (politically and technically) correct
examples to emphasize the concept of web services
- or to change the removed web services example so it is technically correct
and can be put back.


> -----Original Message-----
> From: Mark Little [mailto:mcl@arjuna.com]
> Sent: Tuesday, May 01, 2001 4:26 AM
> To: Peter Furniss; Savas Parastatidis; 'bt-models'
> Subject: Re: F2f meeting
> > My recollection is that both were going back in, with some
> renaming of the
> > web-services one. I can't find anything in my notes on this, though they
> > (the notes) do say that I was going to write up a use case clarifying an
> > out-of-stock example  and/or something on different ways of undoing. I'm
> > doing the main document revision first though.
> What is the point of putting the Web Services example back in for
> BTP? It's
> in the HP submission specifically to show that multiple one-phase commit
> resources shouldn't (IMO) be "coordinated" in a two-phase
> protocol precisely
> because it can lead to the wrong preconceptions about quality of
> service and
> coordination. Multiple one phase aware resources cannot be
> coordinated in a
> reliable manner. As I've mentioned several times, we obviously can't stop
> people spoofing BTP by wrapping one-phase resources in a two-phase
> interface, and simply not having an undo, but if that happens and
> they cause
> the cohesion to fail, we should report it to the business logic
> and let the
> open market dictate whether that resource is used again.
> Granted the Web Services example is the only one that actually
> mentioned Web
> Service in the text. However, that's not a sufficient reason to
> put it back.
> Let's change some of the text in the other examples and explicitly put Web
> Service in if that's what bothers people. I think it's kind of implicit
> anyway.
> Mark.
> ----------------------------------------------
> Dr. Mark Little (mark@arjuna.com)
> Transactions Architect, HP Arjuna Labs
> Phone +44 191 2064538
> Fax   +44 191 2064203

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