| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp>, Muhammad Usama <m(dot)usama(at)gmail(dot)com>, amul sul <sulamul(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Sawada Masahiko <sawada(dot)mshk(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Ildar Musin <ildar(at)adjust(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Chris Travers <chris(dot)travers(at)adjust(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
| Subject: | Re: Transactions involving multiple postgres foreign servers, take 2 |
| Date: | 2020-06-16 16:54:06 |
| Message-ID: | 20200616165406.GB12171@momjian.us |
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| Lists: | pgsql-hackers |
On Tue, Jun 16, 2020 at 06:42:52PM +0530, Ashutosh Bapat wrote:
> > Is there some mapping between GXID and XIDs allocated for each node or
> > will each node use the GXID as XID to modify the data? Are we fine
> > with parking the work for global snapshots and atomic visibility to a
> > separate patch and just proceed with the design proposed by this
> > patch?
>
> Distributed transaction involves, atomic commit, atomic visibility
> and global consistency. 2PC is the only practical solution for atomic
> commit. There are some improvements over 2PC but those are add ons to
> the basic 2PC, which is what this patch provides. Atomic visibility
> and global consistency however have alternative solutions but all of
> those solutions require 2PC to be supported. Each of those are large
> pieces of work and trying to get everything in may not work. Once we
> have basic 2PC in place, there will be a ground to experiment with
> solutions for global consistency and atomic visibility. If we manage
> to do it right, we could make it pluggable as well. So, I think we
> should concentrate on supporting basic 2PC work now.
Very good summary, thank you.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EnterpriseDB https://enterprisedb.com
The usefulness of a cup is in its emptiness, Bruce Lee
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