Re: 2-phase commit

On Mon, 2003-09-29 at 15:55, Peter Eisentraut wrote:
> Manfred Spraul writes:
>
> > Ok. Lets assume one coordinator, two partitipants.
> > Global commit send to both by coordinator. One replies with ok, the
> > other one remains silent.
> > What should the coordinator do? It can't fail the transaction - the
> > first partitipant has commited its part. It can't complete the
> > transaction, because the ok from the 2nd partitipant is still outstanding.
>
> If a participant doesn't reply in an orderly fashion (say, after timeout),
> it just gets kicked out of the whole mechanism.  That isn't the
> interesting part.  The interesting part is what happens when the
> coordinator fails.

The hot-standby coordinator picks up where the first one left off. Just
like when the participant fails the hot-standby for that participant
steps up to the plate.

For the application server side in Java, I believe the standard is OTS
(Object Transaction Service).