Re: Two-phase commit

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Re: Two-phase commit

Bruce Momjian-2

I have added this thread as a link on the TODO list under TODO.detail.

I know folks are working on this for 8.1 but now they can get the
discussions all in one place.

---------------------------------------------------------------------------

Heikki Linnakangas wrote:

> I've been very slowly continuing my work on two-phase commits for a couple
> months now, and I now have my original patch updated so that it applies to
> the current CVS tip, with some improvements.
>
> The patch introduces three new commands, PREPCOMMIT, COMMITPREPARED and
> ABORTPREPARED.
>
> To start a 2PC transaction, you first do a BEGIN and your updates as
> usual. At the end of the transaction, you call PREPCOMMIT 'foobar' instead
> of COMMIT. Now the transaction is in prepared state, ready to commit at a
> later time. 'foobar' is the global transaction identifier assigned for the
> transaction.
>
> Later, when you want to finish the second phase, you call
> COMMITPREPARED 'foobar';
>
> There is a system view pg_prepared_xacts that gives you all transactions
> that are in prepared state waiting for COMMITPREPARED or ABORTPREPARED.
>
> I have also done some work on XA-enabling the JDBC drivers, now that we
> have what it takes in the server side. I have succesfully executed
> 2PC transactions with JBossMQ and Postgres, using JBoss as the
> transaction manager, so the basic stuff seems to be working.
>
> Please have a look and comment, the patches can be found here:
> http://www.iki.fi/hlinnaka/pgsql/
>
> What is the schedule for 7.5? Any chance of getting this in?
>
> - Heikki
>
>
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