On 07.03.2011 17:03, Andrew Dunstan wrote:
This is about expectations. The thing that worries me is that the use of
this term might cause some people NOT to use 2PC because they think they
are getting an equivalent guarantee, when in fact they are not. And
that's hardly unreasonable. Here for example is what wikipedia says
<http://en.wikipedia.org/wiki/Replication_%28computer_science%29>:
Synchronous replication - guarantees "zero data loss" by the means
of atomic write operation, i.e. write either completes on both sides
or not at all. Write is not considered complete until
acknowledgement by both local and remote storage.
Hmm, I've read that wikipedia definition before, but the "atomic" part
never caught my eye. You do get zero data loss with what we have; if a
meteor strikes the master, no acknowledged transaction is lost. I find
that definition a bit confusing.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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