| From: | Marko Kreen <markokr(at)gmail(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Daniel Farina <daniel(at)heroku(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Andrey Velikoredchanin <uncleandyv(at)gmail(dot)com> |
| Subject: | Re: Standbys, txid_current_snapshot, wraparound |
| Date: | 2012-03-29 14:29:37 |
| Message-ID: | 20120329142937.GA9947@gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Thu, Mar 29, 2012 at 03:23:01PM +0100, Simon Riggs wrote:
> On Thu, Mar 29, 2012 at 3:04 PM, Marko Kreen <markokr(at)gmail(dot)com> wrote:
> > Next question: how can flipping archive_mode on and off,
> > with restarts, near wraparound point, break epoch on master?
> >
> > http://lists.pgfoundry.org/pipermail/skytools-users/2012-March/001609.html
> >
> > Any ideas?
> >
> > Could WAL playback from backend with different archive_mode setting
> > cause it somehow?
>
> The current code would allow it, if you managed to go for 4 billion
> xids between checkpoints. If that happened, it would give an off by
> one error each time it happened.
>
> I don't believe that is possible.
Yes, that does not sound like probable case.
--
marko
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