> You could do the replication in the database (e.g. postgresql with
> slony). Then you do not need the supermaster feature.
That is something we are actually trying to avoid at all costs: we have Oracle
doing regular notify and transfer requests on port 53.
We explicitly do not want to depend on any particular database features for DNS
records' replication.
However, what we do want is synchronous multimaster replication, which gives
one HA clustering. Last I checked, "slony" does not do that, unless there have
been changes since.
My understanding of "slony" is that it is basically a standby replicator like
Oracle DataGuard sans automatic failover. What we want is a grid of database
nodes which all participate in UPDATE and DELETE statements, so that the load
is spread across the entire cluster, and nodes may fail arbitrarily but the
database is still up and running without skipping a single transaction.
Now, there have been patches that a few guys from Japan have done to PostgreSQL
itself which make it have synchronous multimaster replication, essentially
enabling HA clustering with PostgreSQL, but as our resources are limited, we
haven't gotten to that yet.
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