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Re: Block-level CRC checks

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Block-level CRC checks
Date: 2009-12-01 21:23:09
Message-ID: 200912012123.nB1LN9n07210@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Andrew Dunstan wrote:
> 
> 
> Tom Lane wrote:
> > Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> >   
> >> OK, fair enough.  My implication that only page formats were at issue
> >> was off-base.  My underlying point was that I think we have to be
> >> prepared to write code that can understand old binary formats (on the
> >> tuple, page, or relation level) if we want this to work and work
> >> reliably.  I believe that there has been much resistance to that idea.
> >>     
> >
> > We keep looking for cheaper alternatives.  There may not be any...
> >
> > 			
> >   
> 
> Yeah. I think we might need to bite the bullet on that and start 
> thinking more about different strategies for handling page versioning to 
> satisfy various needs. I've been convinced for a while that some sort of 
> versioning scheme is inevitable, but I do understand the reluctance.

I always felt our final solution would be a combination of pg_migrator
for system catalog changes and page format conversion for page changes.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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