From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Function to move the position of a replication slot |
Date: | 2017-08-17 01:33:50 |
Message-ID: | 20170817013350.mgrxmvyycqbxnmqj@alap3.anarazel.de |
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Lists: | pgsql-hackers |
On 2017-08-16 21:25:48 -0400, Robert Haas wrote:
> On Wed, Aug 16, 2017 at 5:55 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > I think we should constrain the API to only allow later LSNs than
> > currently in the slot, rather than arbitrary ones. That's why I was
> > thinking of "forward". I'm not convinced it's a good / safe idea to
> > allow arbitrary values to be set.
>
> Maybe I shouldn't play the devil's advocate here, but isn't a feature
> like this by definition only for people who Know What They Are Doing?
> If so, why not let them back the slot up? I'm sure that will work out
> just fine. They Know What They Are Doing.
I have yet to hear a reason for allowing to move things backward etc. So
I'm not sure what the benefit would be. But more importantly I'd like to
make this available to non-superusers at some point, and there I think
it's more important that they can't do bad things. The reason for
allowing it for non-superusers is that I think it's quite a useful
function to be used by an automated system. E.g. to ensure enough, but
not too much, WAL is available for a tertiary standby both on the actual
primary and a failover node.
Greetings,
Andres Freund
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