| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Daniel Farina <daniel(at)heroku(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: XMin Hot Standby Feedback patch |
| Date: | 2011-02-15 16:54:22 |
| Message-ID: | 4D5AAFBE.7040403@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 15.02.2011 18:52, Robert Haas wrote:
> On Tue, Feb 15, 2011 at 11:49 AM, Heikki Linnakangas
> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>> It would be wise to also transmit the epoch in addition to xmin, to avoid
>> confusion if the standby is> 2 billion transactions behind.
>
> That case is probably hopelessly broken anyway.
I don't expect the feedback to do anything too useful in case of xid
wraparound, but at least the master would recognize the situation and
know to ignore the bogus xmin from that standby.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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