| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Sergey Burladyan <eshkinkot(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Dmitriy Sarafannikov <dsarafannikov(at)yandex(dot)ru>, Vladimir Borodin <root(at)simply(dot)name> |
| Subject: | Re: Broken hint bits (freeze) |
| Date: | 2017-06-29 01:27:34 |
| Message-ID: | 20170629012734.GB16576@momjian.us |
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| Lists: | pgsql-hackers |
On Sat, Jun 24, 2017 at 09:24:21AM +0530, Amit Kapila wrote:
> > I was not clear. I was not saying there can be only one extra WAL file.
> > I am saying the "Latest checkpoint location" should be one WAL file
> > farther on the master. I think the big problem is that we need a full
> > replay of that WAL file, not just having it one less than the master.
> >
>
> If the user has properly shutdown, then that last file should only
> have checkpoint record, is it safe to proceed with upgrade without
> actually copying that file?
Yes, but how do we know they processed all the records in the
second-to-last WAL file (in WAL shipping mode).
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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