Re: pg_upgrade resets timeline to 1

On Thu, May 28, 2015 at 08:47:07AM +0100, Simon Riggs wrote:
>     We could have pg_upgrade increment the timeline and allow for missing
>     history files, but that doesn't fix problems with non-pg_upgrade
>     upgrades, which also should never be sharing WAL files from previous
>     major versions.
> 
> 
> Maybe, but I thought we had a high respect for backwards compatibility and we
> clearly just broke quite a few things that didn't need to be broken.

I can't break something that was never intended to work, and mixing WAL
from previous major versions was never designed to work.

> Hmm, it looks like the change to TimeLine 1 is just a kludge anyway. The rule
> that TimeLine 1 doesn't need a history file is itself a hack.
> 
> What we should be saying is that the last timeline doesn't need a history file.
> Then no change is needed here.

Yes, that would make a lot more sense than what we have now, but this
had to be backpatched, so reverting to the 9.3 and earlier behavior
seemed logical.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + Everyone has their own god. +