| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
| Cc: | Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, "ashutosh(dot)bapat(dot)oss(at)gmail(dot)com" <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, "sawada(dot)mshk(at)gmail(dot)com" <sawada(dot)mshk(at)gmail(dot)com>, "masao(dot)fujii(at)oss(dot)nttdata(dot)com" <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, "m(dot)usama(at)gmail(dot)com" <m(dot)usama(at)gmail(dot)com>, "ikedamsh(at)oss(dot)nttdata(dot)com" <ikedamsh(at)oss(dot)nttdata(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "sulamul(at)gmail(dot)com" <sulamul(at)gmail(dot)com>, "alvherre(at)2ndquadrant(dot)com" <alvherre(at)2ndquadrant(dot)com>, "thomas(dot)munro(at)gmail(dot)com" <thomas(dot)munro(at)gmail(dot)com>, "ildar(at)adjust(dot)com" <ildar(at)adjust(dot)com>, "horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp" <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, "chris(dot)travers(at)adjust(dot)com" <chris(dot)travers(at)adjust(dot)com>, "robertmhaas(at)gmail(dot)com" <robertmhaas(at)gmail(dot)com>, "ishii(at)sraoss(dot)co(dot)jp" <ishii(at)sraoss(dot)co(dot)jp> |
| Subject: | Re: Transactions involving multiple postgres foreign servers, take 2 |
| Date: | 2020-10-21 10:08:34 |
| Message-ID: | CAA4eK1K_edn6ib2__zLoP=BTAkaQb3uxMF271=5NQ=+N8x48uA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Oct 21, 2020 at 3:03 PM tsunakawa(dot)takay(at)fujitsu(dot)com
<tsunakawa(dot)takay(at)fujitsu(dot)com> wrote:
>
> From: Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>
> > So what's your opinion?
>
> * Global visibility
> This is what Amit-san suggested some times -- "design it before reviewing the current patch." I'm a bit optimistic about this and think this FDW 2PC can be implemented separately as a pure enhancement of FDW. But I also understand his concern. If your (our?) aim is to use this FDW 2PC for sharding,
>
As far as I understand that is what the goal is for which this is a
step. For example, see the wiki [1]. I understand that wiki is not the
final thing but I have seen other places as well where there is a
mention of FDW based sharding and I feel this is the reason why many
people are trying to improve this area. That is why I suggested having
an upfront design of global visibility and a deadlock detector along
with this work.
[1] - https://wiki.postgresql.org/wiki/WIP_PostgreSQL_Sharding
--
With Regards,
Amit Kapila.
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