| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| 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 20:04:58 |
| Message-ID: | 20170321200458.GA2827@momjian.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
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| Lists: | pgsql-hackers |
On Tue, Mar 21, 2017 at 04:56:16PM -0300, Alvaro Herrera wrote:
> 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.
Yes, but once it is written it will take years before those bits can be
used on most installations.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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