| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Phil Sorber <phil(at)omniti(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Abhijit Menon-Sen <ams(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: logical changeset generation v4 - Heikki's thoughts about the patch state |
| Date: | 2013-01-24 01:21:00 |
| Message-ID: | 51008C7C.9030207@commandprompt.com |
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| Lists: | pgsql-hackers |
On 01/23/2013 05:17 PM, Robert Haas wrote:
> Of course, I have no evidence that that will happen. But it is a
> really big piece of code, and therefore unless you are superman, it's
> probably got a really large number of bugs. The scary thing is that
> it is not as if we can say, well, this is a big hunk of code, but it
> doesn't really touch the core of the system, so if it's broken, it'll
> be broken itself, but it won't break anything else. Rather, this code
> is deeply in bed with WAL, with MVCC, and with the on-disk format of
> tuples, and makes fundamental changes to the first two of those. You
> agreed with Tom that 9.2 is the buggiest release in recent memory, but
> I think logical replication could easily be an order of magnitude
> worse.
Command Prompt worked for YEARS to get logical replication right and we
never got it to the point where I would have been happy submitting it to
-core.
It behooves .Org to be extremely conservative about this feature.
Granted, it is a feature we should have had years ago but still. It is
not a simple thing, it is not an easy thing. It is complicated and
complex to get correcft.
JD
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