Re: Proposal: Implement failover on libpq connect level.

On Wed, Aug 19, 2015 at 4:46 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:

> On 2015-08-19 09:41:32 -0400, Tom Lane wrote:
> > In fact, they'd still need to use DNS balancing for Postgres,
> > because not everything connects with libpq (think JDBC for instance).
>
> It already does support this though.
>
> https://jdbc.postgresql.org/documentation/head/connect.html :
>
> > Connection Fail-over
> >
> > To support simple connection fail-over it is possible to define multiple
> > endpoints (host and port pairs) in the connection url separated by
> > commas. The driver will try to once connect to each of them in order
> > until the connection succeeds. If none succeed, a normal connection
> > exception is thrown.
> >
> > The syntax for the connection url is:
> >
> > jdbc:postgresql://host1:port1,host2:port2/database
>

yes, I also wanted to show this, but you was quicker.

>
>
> > So I think we ought to reject this proposal, full stop. I see no
> > reason to re-invent this wheel, and there are good reasons not to.
>
> I don't really buy this argument. Allowing to connect to several
> endpoints isn't exactly "new tech" either. A lot of database connectors
> do support something very close to the above pgjdbc feature.
>

mysql, for example.

>
> Greetings,
>
> Andres Freund
>
>
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