Subject: Re: Reviewing freeze map code
To: Peter Geoghegan <pg@heroku.com>, Andres Freund <andres@anarazel.de>
References: <20160506212958.wwwc22hfesvj76af@alap3.anarazel.de>
 <20160506213652.GA288015@alvherre.pgsql>
 <20160506214943.d44r4glxgw2ff2sg@alap3.anarazel.de>
 <CAM3SWZQf7VsUkMtSnzDrA0ECsZgjV07r3kD6XvRR-qJGNLWVnQ@mail.gmail.com>
CC: Alvaro Herrera <alvherre@2ndquadrant.com>, "Joshua D. Drake"
	<jd@commandprompt.com>, Josh berkus <josh@agliodbs.com>, Robert Haas
	<robertmhaas@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>,
	"pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, Jeff Janes
	<jeff.janes@gmail.com>
From: Jim Nasby <Jim.Nasby@BlueTreble.com>
Message-ID: <1e78ce70-db1e-e639-f758-dc202f56ab5e@BlueTreble.com>
Date: Tue, 10 May 2016 23:42:53 -0500
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On 5/6/16 4:55 PM, Peter Geoghegan wrote:
> On Fri, May 6, 2016 at 2:49 PM, Andres Freund <andres@anarazel.de> wrote:
>>> Jeff Janes has done astounding work in these matters.  (I don't think
>>> we credit him enough for that.)
>>
>> +many.
>
> Agreed. I'm a huge fan of what Jeff has been able to do in this area.
> I often say so. It would be even better if Jeff's approach to testing
> was followed as an example by other people, but I wouldn't bet on it
> ever happening. It requires real persistence and deep understanding to
> do well.

It takes deep understanding to *design* the tests, not to write them. 
There's a lot of folks out there that will never understand enough to 
design tests meant to expose data corruption but who could easily code 
someone else's design, especially if we provided tools/ways to tweak a 
cluster to make testing easier/faster (such as artificially advancing 
XID/MXID).
-- 
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
855-TREBLE2 (855-873-2532)   mobile: 512-569-9461


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