[CentOS-devel] Upgrading postgresql (Re: CentOS/RHEL 5.3)
n3npq at mac.com
Thu Jan 22 23:06:07 UTC 2009
On Jan 22, 2009, at 5:43 PM, Les Mikesell wrote:
>> Personally, I think that database upgrades have almost nothing
>> to do with instaling packages, but I'd rather add whatever is useful
>> than discuss well known RPM deficiencies for another decade.
> The reason the discussion is intertwined with packaging is that if you
> name the delivered files the same, the old and new can never co-
> exist as
> they should for the conversion and test period.
In fact, the old <-> new can/do coexist during upgrade; lib/fsm.c in
RPM has had
a form of apply/commit since forever that puts the new in place (the
does not remove the old (renaming into old is the commit).
And there are provisions to rename the old into a subdirectory
as part of committing the new; at least the necessary path
name generation including a subdirectory has been there
since forever in RPM. Adding the necessary logic to
achieve whatever goal is desired installing files is just not that hard,
the code is a state machine.
Personally (and as I pointed out), including old files in the new
is likelier to be reliable, and has the additional benefit that whatever
conversions are needed can be done anytime, not just during a "window"
during upgrade where old <-> new coexist. A conversion side-effect at
the scale of a database conversion is hugely complicated to guarantee
reliability during a "window". Are you volunteering to test?
> I think the only way it can be done reasonably is to install the new
> code with different names and/or paths and scripts that can be run
> to do the conversion and (after testing) replacement of the old
You think, I know, is the difference.
But as always
Patches cheerfully accepted.
And you *really* need to take this conversation to an RPM list instead.
I'd add the CC, but I have no idea what RPM you wish to use.
73 de Jeff
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