Re: replication in Postgres

glynastill(at)yahoo(dot)co(dot)uk (Glyn Astill) writes:
> It it possible to get a system that does syncronous replication and
> also allows slaves to catch up if they're down for a period of time
> like you can with asyncronous?

Well, a "modal approach" is possible - that's what Postgres-R tries to
do.

Of course, once you drop into a mode that "allows slaves to catch up,"
then you have given up on synchronicity, and have fallen back to
asynchronous replication.

If you systematically have a way to do that, then you no longer have a
replication system that can honestly be called "synchronous."

If it's *truly* synchronous, then when nodes fall over, the system
MUST stop accepting transactions.
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