| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(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 19:56:16 |
| Message-ID: | 20170321195616.uhxtpwbbl6xlhuok@alvherre.pgsql |
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| Lists: | pgsql-hackers |
Bruce Momjian wrote:
> On Tue, Mar 21, 2017 at 04:43:58PM -0300, Alvaro Herrera wrote:
> > Bruce Momjian wrote:
> >
> > > I don't think it makes sense to try and save bits and add complexity
> > > when we have no idea if we will ever use them,
> >
> > If we find ourselves in dire need of additional bits, there is a known
> > mechanism to get back 2 bits from old-style VACUUM FULL. I assume that
> > the reason nobody has bothered to write the code for that is that
> > there's no *that* much interest.
>
> We have no way of tracking if users still have pages that used the bits
> via pg_upgrade before they were removed.
Yes, that's exactly the code that needs to be written.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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