| From: | Amit Kapila <amit(dot)kapila(at)huawei(dot)com> |
|---|---|
| To: | "'Andres Freund'" <andres(at)2ndquadrant(dot)com>, "'Hari Babu'" <haribabu(dot)kommi(at)huawei(dot)com> |
| Cc: | "'Robert Haas'" <robertmhaas(at)gmail(dot)com>, "'Josh Berkus'" <josh(at)agliodbs(dot)com>, <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Review: Patch to compute Max LSN of Data Pages |
| Date: | 2013-07-08 11:40:43 |
| Message-ID: | 015101ce7bcf$fb8d47f0$f2a7d7d0$@kapila@huawei.com |
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| Lists: | pgsql-hackers |
On Monday, July 08, 2013 4:26 PM Andres Freund wrote:
> On 2013-07-08 16:17:54 +0530, Hari Babu wrote:
> > + This utility can also be used to decide whether backup is
> required or not when the data page
> > + in old-master precedes the last applied LSN in old-standby
> (i.e., new-master) at the
> > + moment of the failover.
> > + </para>
> > + </refsect1>
>
> I don't think this is safe in any interesting set of cases. Am I
> missing
> something?
No, you are not missing anything. It can be only used to find max LSN in
database which can avoid further corruption
> People falsely thinking that it can be used for this is the primary
> reason for me objecting the patch...
With Regards,
Amit Kapila.
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