On 18 February 2016 at 20:35, Michael Paquier <michael.paqu...@gmail.com>
> On Thu, Feb 18, 2016 at 5:35 PM, Amit Langote
> <langote_amit...@lab.ntt.co.jp> wrote:
> > On 2016/02/18 16:38, Craig Ringer wrote:
> >> I should resurrect Abhijit's patch to allow the isolationtester to talk
> >> multiple servers. We'll want that when we're doing tests like "assert
> >> this change isn't visible on the replica before it becomes visible on
> >> master". (Well, except we violate that one with our funky
> >> synchronous_commit implementation...)
> > How much does (or does not) that overlap with the recovery test suite
> > undertaken by Michael et al? I saw some talk of testing for patches in
> > works on the N synchronous standbys thread.
> This sounds like poll_query_until in PostgresNode.pm (already on HEAD)
> where the query used is something on pg_stat_replication for a given
> LSN to see if a standby has reached a given replay position.
No, it's quite different, though that's something handy to have that I've
emulated in the isolationtester using a plpgsql function.
The isolationtester changes in question allow isolationtester specs to run
different blocks against different hosts/ports/DBs.
That lets you make assertions about replication behaviour. It was built
for BDR and I think we'll need something along those lines in core if/when
any kind of logical replication facilities land, for things like testing
failover slots, etc.
The patch is at:
and might be something it's worth having in core as we expand testing of
replication, failover, etc.
Craig Ringer http://www.2ndQuadrant.com/
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