Joachim Wieland wrote: > On Fri, Nov 20, 2009 at 7:51 AM, Heikki Linnakangas > <heikki.linnakan...@enterprisedb.com> wrote: >>> Note that we don't preserve notifications when the database restarts. >>> But 2PC can cope with restarts. How would that fit together? >> The notifications are written to the state file at prepare. They can be >> recovered from there and written to the queue again at server start (see >> twophase_rmgr.c). > > Okay, but which of the backends would then leave its pointer at that > place in the queue upon restart? > > This is also an issue for the non-restart case, what if you prepare > the transaction in one backend and commit in the other?
The dummy procs that represent prepared transactions need to be treated as backends. Each prepared transaction needs a slot of its own in the backends array. -- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
