Re: Freeze avoidance of very large table.

From: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Greg S <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Freeze avoidance of very large table.
Date: 2016-02-02 16:16:54
Message-ID: CAD21AoBw+FM8_YKe+=xqV5Nt_SEZrkT+N4+ANnA=zC-fs1M8oA@mail.gmail.com
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On Tue, Feb 2, 2016 at 10:05 PM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
> This patch has gotten its fair share of feedback in this fest. I moved
> it to the next commitfest. Please do keep working on it and reviewers
> that have additional comments are welcome.

Thanks!

On Tue, Feb 2, 2016 at 8:59 PM, Kyotaro HORIGUCHI
<horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> Since the destination version is fixed, the advantage of the
> plugin mechanism for pg_upgade would be capability to choose a
> plugin to load according to some characteristics of the source
> database. What do you think the trigger characteristics for
> convertLayoutVM_add_frozenbit.so or similars? If it is hard-coded
> like what transfer_single_new_db is doing for fsm and vm, I
> suppose the module is not necessary to be a plugin.

Sorry, I couldn't get it.
You meant that we should use rewriteVisibilityMap as a function (not
dynamically load)?
The destination version is not fixed, it depends on new cluster version.
I'm planning that convertLayoutVM_add_frozenbit.so is dynamically
loaded and used only when rewriting of VM is required.
If layout of VM will be changed again in the future, we could add
other libraries for convert

Regards,

--
Masahiko Sawada

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