From: | Stephen Frost <sfrost(at)snowman(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Peter Geoghegan <pg(at)heroku(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: INSERT ... ON CONFLICT UPDATE/IGNORE 4.0 |
Date: | 2015-05-08 19:16:00 |
Message-ID: | 20150508191600.GA30322@tamriel.snowman.net |
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* Tom Lane (tgl(at)sss(dot)pgh(dot)pa(dot)us) wrote:
> I wrote:
> > Peter Geoghegan <pg(at)heroku(dot)com> writes:
> >> On Fri, May 8, 2015 at 11:59 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >>> Ooops. But shouldn't that have failed 100% of the time in a CCA build?
> >>> Or is the candidates list fairly noncritical?
>
> >> The candidates list is absolutely critical.
>
> > Oh, I was confusing CCA with RELCACHE_FORCE_RELEASE, which does something
> > a bit different.
>
> Actually, looking closer, the quoted code is simply not broken without
> RELCACHE_FORCE_RELEASE: without that, neither heap_close nor index_close
> will do anything that could cause a cache flush. So while it's certainly
> good pratice to move that lappend_oid call up, it does not explain the
> observed symptoms. We still need some more investigation here.
Couldn't a cache flush request come from another backend? Although this
isn't being run in a parallel group, is it? Maybe a delayed signal that
happens to show up late at just the right time? Dunno if we've ever
actually seen that but the thought occured to me.
Thanks!
Stephen
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