On 04/29/2016 08:32 AM, Bruce Momjian wrote:
On Tue, Apr 12, 2016 at 11:25:21AM -0700, Josh Berkus wrote:
Here's the features I can imagine being worth major backwards
compatibility breaks:
5. Transparent upgrade-in-place (i.e. allowing 10.2 to use 10.1's tables
without pg_upgrade or other modification).

Technically, this is exactly what pg_upgrade does.  I think what you
really mean is for the backend binary to be able to read the system
tables and WAL files of the old clusters --- something I can't see us
implementing anytime soon.

For the most part, pg_upgrade is good enough. There are exceptions and it does need a more thorough test suite but as a whole, it works. As nice as being able to install 9.6 right on top of 9.5 and have 9.6 magically work, it is certainly not a *requirement* anymore.



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