Re: pg_upgrade and epoch

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Sergey Konoplev <gray(dot)ru(at)gmail(dot)com>
Cc: Sergey Burladyan <eshkinkot(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_upgrade and epoch
Date: 2014-09-03 02:59:05
Message-ID: 20140903025905.GC14893@momjian.us
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On Wed, Apr 23, 2014 at 12:41:41PM -0700, Sergey Konoplev wrote:
> On Wed, Apr 23, 2014 at 5:26 AM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > Sergey, are you seeing a problem only because you are
> > interacting with other systems that didn't reset their epoch?
>
> I faced this after upgrading clusters with PgQ Skytools3 installed
> only. They didn't interact with any other systems.

I have developed the attached patch which causes pg_upgrade to preserve
the transaction epoch. I plan to apply this for PG 9.5.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ Everyone has their own god. +

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epoch.diff text/x-diff 3.1 KB

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