On Wed, Apr 17, 2013 at 01:22:01PM -0400, Tom Lane wrote:
> Greg Stark <st...@mit.edu> writes:
> > On Wed, Apr 17, 2013 at 4:28 PM, Florian Pflug <f...@phlo.org> wrote:
> >> Is there any way we can change the checksum algorithm in 9.4
> >> *without* breaking pg_upgrade?
> > Personally I think we're going to need a solution for page format
> > changes someday eventually....
> > What advantages are we postponing now to avoid it?
> Um, other than the ability to make a release?
> We aren't going to hold up 9.3 until that particular bit of pie in the
> sky lands.  Indeed I don't expect to see it available in the next couple
> years either.  When we were looking at that seriously, two or three
> years ago, arbitrary page format changes looked *hard*.
> The idea of bumping the page format version number to signal a checksum
> algorithm change might work though.

Uh, not sure how pg_upgrade would detect that as the version number is
not stored in pg_controldata, e.g.:

        Data page checksums:                  enabled/disabled

Do we need to address this for 9.3?  (Yuck)

  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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