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From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Josh berkus <josh@agliodbs.com>
To: Peter Geoghegan <pg@heroku.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Noah Misch <noah@leadboat.com>
Cc: David Rowley <david.rowley@2ndquadrant.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Magnus Hagander <magnus@hagander.net>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Rename max_parallel_degree?
Date: Tue, 31 May 2016 14:17:32 -0400
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On 5/31/16 2:02 PM, Josh berkus wrote:
> I get where you're coming from, but I think Haas's query plan output is
> going to show us the confusion we're going to get.  So we need to either
> change the parameter, the explain output, or brace ourselves for endless
> repeated questions.

Changing the explain output doesn't sound so bad to me.

The users' problem is that the parameter setting ought to match the 
EXPLAIN output.

The developers' problem is that the EXPLAIN output actually corresponds 
to leader + (N-1) workers internally.

I think we can hope that developers are going to be less confused about 
that than users.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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