On Thu, 2007-06-14 at 16:14 -0700, Craig James wrote:
> Looking for replication solutions, I find:
>
> Slony-I
> Seems good, single master only, master is a single point of failure,
> no good failover system for electing a new master or having a failed
> master rejoin the cluster. Slave databases are mostly for safety or
> for parallelizing queries for performance. Suffers from O(N^2)
> communications (N = cluster size).
>
There's MOVE SET which transfers the origin (master) from one node to
another without losing any committed transactions.
There's also FAILOVER, which can set a new origin even if the old origin
is completely gone, however you will lose the transactions that haven't
been replicated yet.
To have a new node join the cluster, you SUBSCRIBE SET, and you can MOVE
SET to it later if you want that to be the master.
Regards,
Jeff Davis
