The documentation at
http://www.slony.info/documentation/slonylistenercosts.html states that 

"It is necessary to have sl_listen entries allowing connection from each
node to every other node. Most will normally not need to be [used] (sic)
very heavily, but it still means that there needs to be n(n-1) paths."

I have been running perfectly fine for several months where this is not
true.  I have a master node A with 4 sets.  Node B replicates all 4 sets and
there is of course a path between A and B.  Node C replicates 2 sets and
there is a path between A and C.  But there is no path between B and C.  

As far as I know, this simply means that I will be restricted if I try to do
things like FAILOVER or MOVE SET.  I'm thinking if I need to do that, I can
add the necessary paths at that time.  But not having the extra path from
B-C all the time saves resources.

In any case, the documentation implies that I MUST have the connection, and
that does not appear to be the case.  

Thanks,
Gordon

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