<p dir="ltr">On 5 May 2016 1:28 a.m., "Andres Freund" <<a
href="mailto:andres@anarazel.de">andres@anarazel.de</a>>wrote:<br /> > On 2016-05-04 18:22:27 -0400, Robert Haas
wrote:<br/> > > How would the semantics change?<br /> ><br /> > Right now the time for computing the
snapshotis relevant, if<br /> > maintenance of xids is moved, it'll likely be tied to the time xids are<br /> >
assigned.That seems perfectly alright, but it'll change behaviour.<p dir="ltr">FWIW moving the maintenance to a clock
tickprocess will not change user visible semantics in any significant way. The change could easily be made in the next
release.<p dir="ltr">Regards,<br /> Ants Aasma