From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
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To: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: is sync rep stalled? |
Date: | 2010-10-05 11:44:36 |
Message-ID: | 1286279076.2025.1187.camel@ebony |
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Lists: | pgsql-hackers |
On Fri, 2010-10-01 at 19:48 +0900, Fujii Masao wrote:
> My intention is to commit the core part of synchronous replication (which would
> be used for every use cases) at first. Then we can implement the
> feature for each
> use case.
I completely agree that we should commit the core part of sync rep, but
the question is: what is that? We both have equally valid "cores".
> I agree that 9.1 should support asynchronous standbys in the same mix, but this
> seems to be extended feature rather than very core.
That is trivial, so no need to exclude that.
> I proposed to implement the "return-immediately" at first because it doesn't
> require standby registration. But if many people think that the "wait-forever"
> is the core rather than the "return-immediately", I'll follow them. We can
> implement the "return-immediately" after that.
I think its fair to say that many people don't like the specific form of
standby registration that has been proposed. I really don't mind if it
exists as an option, but it looks way too complex to me to manage for
realistic systems.
Wait-forever needs to be an option. Nobody actually will wait forever,
so if people select it, they will need some form of clusterware to
control it and I don't want to see people forced to use clusterware.
If people do choose wait-forever, then we could also do standby
registration automatically, to give them something to wait for.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Training and Services
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