| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Jaime Casanova <jaime(dot)casanova(at)2ndquadrant(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Patch: Write Amplification Reduction Method (WARM) |
| Date: | 2017-03-21 17:08:04 |
| Message-ID: | CAH2-WznXeppsohs02-SQ+C8oT80WC3AKtAxXXKTgLhQaVQBnSw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 21, 2017 at 10:04 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> I think that's a good question. I previously expressed similar
> concerns. On the one hand, it's hard to ignore the fact that, in the
> cases where this wins, it already buys us a lot of performance
> improvement. On the other hand, as you say (and as I said), it eats
> up a lot of bits, and that limits what we can do in the future. On
> the one hand, there is a saying that a bird in the hand is worth two
> in the bush. On the other hand, there is also a saying that one
> should not paint oneself into the corner.
Are we really saying that there can be no incompatible change to the
on-disk representation for the rest of eternity? I can see why that's
something to avoid indefinitely, but I wouldn't like to rule it out.
--
Peter Geoghegan
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