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From: Petr Jelinek <petr.jelinek@2ndquadrant.com>
To: Andres Freund <andres@anarazel.de>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Cc: Erik Rijkers <er@xs4all.nl>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Craig Ringer <craig@2ndquadrant.com>
Subject: Re: snapbuild woes
Date: Fri, 5 May 2017 19:32:27 +0200
Message-ID: <76657a2c-ff2c-e328-9df6-6897dbe1a011@2ndquadrant.com> (raw)
In-Reply-To: <20170505161852.vmjwhmum2zoar2xk@alap3.anarazel.de>
References: <20170501005921.qcqd7w2njpv3av6s@alap3.anarazel.de>
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	<209861fc-718f-0a7b-3a1d-36512865c209@2ndquadrant.com>
	<20170501080348.vb6mj5whdex3f7l7@alap3.anarazel.de>
	<e6c1fdfe-50bc-62e4-3ad7-854f6ac5c35e@2ndquadrant.com>
	<20170501191419.coqbtx2jodu22ufz@alap3.anarazel.de>
	<ba7a3052-6e71-d162-d4a0-b5bdd7145c19@2ndquadrant.com>
	<20170505000004.gihrtl7bhxeolf3q@alap3.anarazel.de>
	<20170505004237.edtahvrwb3uwd5rs@alap3.anarazel.de>
	<316d270d-d97e-65ba-dcdd-34f6b13698f6@2ndquadrant.com>
	<20170505161852.vmjwhmum2zoar2xk@alap3.anarazel.de>
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On 05/05/17 18:18, Andres Freund wrote:
> On 2017-05-05 13:53:16 +0200, Petr Jelinek wrote:
>> On 05/05/17 02:42, Andres Freund wrote:
>>> On 2017-05-04 17:00:04 -0700, Andres Freund wrote:
>>>> Attached is a prototype patch for that.
>>>
>>
>> I am not sure I understand the ABI comment for started_collection_at.
>> What's the ABI issue? The struct is private to snapbuild.c module. Or
>> you want to store it in the ondisk snapshot as well?
> 
> It's stored on-disk already :(

Hmm okay, well then I guess we'll have to store it somewhere inside
running, we should not normally care about that since we only load
CONSISTENT snapshots where running don't matter anymore. Alternatively
we could bump the SNAPBUILD_VERSION but that would make it impossible to
downgrade minor version which is bad (I guess we'll want to do that for
master, but not back-branches).

-- 
  Petr Jelinek                  http://www.2ndQuadrant.com/
  PostgreSQL Development, 24x7 Support, Training & Services


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