Re: Changing WAL Header to reduce contention during ReserveXLogInsertLocation()

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Changing WAL Header to reduce contention during ReserveXLogInsertLocation()
Date: 2018-03-24 11:42:47
Message-ID: CANP8+jKyoA-_h=P__mP=aWGvvZ=18Gdg_o6qrp=YRQc6XMnscg@mail.gmail.com
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I suggest we focus on the engineering. I've not discussed this patch
with Pavan offline.

On 23 March 2018 at 23:32, Michael Paquier <michael(at)paquier(dot)xyz> wrote:
> On Fri, Mar 23, 2018 at 11:06:48AM +0000, Simon Riggs wrote:
>> Your assumption that I would commit a new patch that was 29 mins old
>> is frankly pretty ridiculous, so yes, lets keep calm.
>
> When a committer says that a patch is "ready for commit" and that he
> calls for "last objections", I am understanding that you would be ready
> to commit the patch from the moment such an email has been sent. Am I
> the only one to think so? Now let's look at the numbers:
> - The last patch sent is a v2, which implements a completely new
> approach compared to v1. This is a non-trivial patch which touches
> sensitive parts of the code.
> - v2 has been sent exactly two weeks after the last email exchanged on
> this thread.
> - Per the data publicly available, it took less than 30 minutes to
> review the patch, and there are zero comments about its contents.
> I do patch review on a more-or-less daily basis, and look at threads on
> hackers on a daily basis, but I really rarely see such an "efficient"
> review pattern. You and Pavan have likely discussed the patch offline,
> but nobody can guess what has been discussed and what have been the
> arguments exchanged.
>
>> Enjoy your weekend and I'll be happy to read your review on Monday.
>
> Er. So this basically means that I need to do a commitment to look at
> this patch in such a short time frame? If you are asking for reviews,
> doing such requests by asking a proper question rather than by implying
> it in an affirmation would seem more adapted to me, so this email bit is
> making me uncomfortable. My apologies if I am not able to catch the
> nuance in those words.
> --
> Michael

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

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