Re: [HACKERS] No parameter values checking while creating Altersubscription...Connection

On 2017-05-25 17:08:57 -0400, Peter Eisentraut wrote:
> On 5/25/17 10:18, Masahiko Sawada wrote:
> >> postgres=# alter subscription c1 connection 'port=4000';
> >> ALTER SUBSCRIPTION
> >> postgres=# alter subscription c1 connection 'dbname=cc';
> >> ALTER SUBSCRIPTION
> >>
> > CREATE SUBSCRIPTION tries to connect to publisher to create
> > replication slot or to get table list for table synchronization, not
> > to check the connection parameter value. So if you specify connect =
> > false then CREATE SUBSCRIPTION doesn't try to connect.
> 
> We don't make a connection attempt as part of ALTER SUBSCRIPTION.  I
> guess we could just connect and disconnect to check that it works.

I think during reconfigurations it's quite useful to be able to do so
even if the other hosts aren't reachable that second.

- Andres