On Wed, Jan 25, 2023 at 5:26 PM Andres Freund <andres@anarazel.de> wrote:
> Another bad scenario: Some longrunning / hung transaction caused us to get
> close to the xid wraparound. Problem was resolved, autovacuum runs. Previously
> we wouldn't have frozen the portion of the table that was actively changing,
> now we will. Consequence: We get closer to the "no write" limit / the outage
> lasts longer.
Obviously it isn't difficult to just invent a new rule that gets
applied by lazy_scan_strategy. For example, it would take me less than
5 minutes to write a patch that disables eager freezing when the
failsafe is in effect.
> I don't see an alternative to reverting this for now.
I want to see your test case before acting.
--
Peter Geoghegan