Re: Non-reserved replication slots and slot advancing

On 2018-07-03 13:23:50 -0400, Alvaro Herrera wrote:
> On 2018-Jul-03, Andres Freund wrote:
> 
> > I'm not clear to why this is a problem? Seems like either behaviour can
> > be argued for. I don't really have an opinion either way. I'd just
> > remove the item from the open items list, I don't think we need to hold
> > up the release for it?
> 
> After reading this more carefully, isn't the problem that as soon as you
> get a slot into the 0/1 restart_lsn state, WAL recycling/deletion no
> longer happens?  That does sound like a bad thing to me.

Fair enough, but that's what a plain slot allows you as well, pretty
fundamentally, no? The precise point at which recycling will be blocked
will differer, sure.

Greetings,

Andres Freund