Re: Listen / Notify - what to do when the queue is full

Joachim Wieland wrote:
> On Fri, Nov 20, 2009 at 7:51 AM, Heikki Linnakangas
> <heikki.linnakangas@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