| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Beena Emerson <memissemerson(at)gmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Support for N synchronous standby servers - take 2 |
| Date: | 2016-02-11 17:56:09 |
| Message-ID: | CA+TgmoYo-HJ6F6+jY9ov9kBYg7U+=LycxoPCcng8B2QHb9YPkQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Feb 5, 2016 at 3:36 AM, Michael Paquier
<michael(dot)paquier(at)gmail(dot)com> wrote:
> So, here are some thoughts to make that more user-friendly. I think
> that the critical issue here is to properly flatten the meta data in
> the custom language and represent it properly in a new catalog,
> without messing up too much with the existing pg_stat_replication that
> people are now used to for 5 releases since 9.0.
Putting the metadata in a catalog doesn't seem great because that only
can ever work on the master. Maybe there's no need to configure this
on the slaves and therefore it's OK, but I feel nervous about putting
cluster configuration in catalogs. Another reason for that is that if
synchronous replication is broken, then you need a way to change the
catalog, which involves committing a write transaction; there's a
danger that your efforts to do this will be tripped up by the broken
synchronous replication configuration.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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