On Wed, 2009-02-25 at 23:08 +0200, Heikki Linnakangas wrote: > > > > That is exactly the reason why we don't treat an overflowed snapshot as > > a valid starting point. > > We don't? I don't see anything stopping it.
In GetRunningTransactionData() we explicitly set latestRunningXid to InvalidTransactionId if the snapshot is overflowed. That prevents the snapshot from being used to initialise the recovery procs. I'll document that better. You raised that as an annoyance previously because it means that connection in hot standby mode may be delayed in cases of heavy, repeated use of significant numbers of subtransactions. My answer was that there is a way to avoid that but it complicates things and I'm trying my best to avoid complexity in the first release, yet still have it work (this decade :-)) -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
