Re: [RFC: bug fix?] Connection attempt block forever when the synchronous standby is not running

On 2014-07-07 04:20:12 +0000, Rajeev rastogi wrote:
>
> On 04 July 2014 19:29, MauMau Wrote:
>
> > [How to fix]
> > Of course, adding "-o '-c synchronous_commit=local'" or "-o '-c
> > synchronous_standby_names='" to pg_ctl start in the recovery script
> > would prevent the problem.
> >
> > But isn't there anything to fix in PostgreSQL? I think the doc needs
> > improvement so that users won't misunderstand that only write
> > transactions would block at commit.
>
> As of now there is no solution for this in PostgreSQL but I had submitted a patch "Standalone synchronous master" in
> 9.4 2014-01 CommitFest, which was rejected because of some issues. This patch was meant to degrade the synchronous
> level of master, if all synchronous standbys are down.
> I plan to resubmit this with better design sometime in 9.5.

That seems to be more less orthogonal to the issue at hand. The problem
here is that a readonly command lead to a wait. And even worse it was a
command the user had no influence over.

Greetings,

Andres Freund

--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services