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Re: Synchronous replication & Hot standby patches

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, jd(at)commandprompt(dot)com, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, "K, Niranjan (NSN - IN/Bangalore)" <niranjan(dot)k(at)nsn(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Synchronous replication & Hot standby patches
Date: 2009-02-25 21:03:44
Message-ID: 1235595824.16176.343.camel@ebony.2ndQuadrant (view raw or flat)
Thread:
Lists: pgsql-hackers
On Wed, 2009-02-25 at 22:45 +0200, Heikki Linnakangas wrote:
> Robert Haas wrote:
> > I think the more relevant question right now is whether the work Fujii
> > Masao is planning to do for 8.5 is reponsive to the following comment
> > from Heikki:
> > 
> > # IMHO, the synchronous replication isn't in such good shape, I'm
> > afraid. I've said
> > # this before, but I'm not happy with the "built from spare parts"
> > nature of it. You
> > # shouldn't have to configure an archive, file-based log shipping using rsync or
> > # whatever, and pg_standby. All that is in addition to the direct
> > connection between
> > # master and slave. The slave really should be able to just connect to
> > the master, and
> > # download all the WAL it needs directly. That's a huge usability
> > issue if left as is,
> > # but requires very large architectural changes to fix.
> 
> I believe so, see second bullet point in:
> 
> http://archives.postgresql.org/message-id/3f0b79eb0902240751t13231593g17fbef70664d4444@mail.gmail.com

That is exactly what I am against. Note the words "get rid of".

This prevents parallel data transfer, use of split mirrors and various
other techniques. It sounds neater, but it implies removal of useful
features.

-- 
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Training, Services and Support


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Subject: Re: Hot standby, running xacts, subtransactions
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Subject: Re: Synchronous replication & Hot standby patches

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