| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: replication_slots usability issue |
| Date: | 2018-10-31 22:48:02 |
| Message-ID: | 20181031224802.lamhfjil7uwpfiee@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2018-10-30 10:52:54 -0700, Andres Freund wrote:
> On 2018-10-30 11:51:09 +0900, Michael Paquier wrote:
> > On Mon, Oct 29, 2018 at 12:13:04PM -0700, Andres Freund wrote:
> > > I don't think this quite is the problem. ISTM the issue is rather that
> > > StartupReplicationSlots() *needs* to check whether wal_level > minimal,
> > > and doesn't. So you can create a slot, shutdown, change wal_level,
> > > startup. A slot exists but won't work correctly.
> >
> > It seems to me that what we are looking for is just to complain at
> > startup if we find any slot data and if trying to start up with
> > wal_level = minimal.
>
> Right, we really should just call CheckSlotRequirements() before doing
> so. I'll make it so, once I'm actually awake and had some coffee.
And done. Thanks for the report JD.
- Andres
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