Re: Parallel tuplesort (for parallel B-Tree index creation)

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Peter Geoghegan <pg(at)heroku(dot)com>
Cc: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: Parallel tuplesort (for parallel B-Tree index creation)
Date: 2016-12-04 01:45:44
Message-ID: 20161204014544.55snjukv3xcuesyb@alvherre.pgsql
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Peter Geoghegan wrote:
> On Mon, Nov 7, 2016 at 8:28 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> > What do we need to teach pg_restore about parallel CREATE INDEX, if
> > anything at all? Could this be as simple as a blanket disabling of
> > parallelism for CREATE INDEX from pg_restore? Or, does it need to be
> > more sophisticated than that? I suppose that tools like reindexdb and
> > pgbench must be considered in a similar way.
>
> I still haven't resolved this question, which seems like the most
> important outstanding question,

I don't think a patch must necessarily consider all possible uses that
the new feature may have. If we introduce parallel index creation,
that's great; if pg_restore doesn't start using it right away, that's
okay. You, or somebody else, can still patch it later. The patch is
still a step forward.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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