can you verify your setup? you seem to have already two nodes when you start your test.
thanks for your reply. my test only involves two servers. (notice that the extra node in the log had the same host name, only different port number)
i double-checked my cluster-server.xml and found out that the only change i made is to create my own partition (by copy/past the DefaultPartition element and change its name).
after i removed my partition, the extra message ("extra node") went away.
is this a bug, or how should i configure a second partition?
no that's the expected behaviour: by adding your own partition, it will behave as an independent new node of the cluster, even if then you have two partitions running in the same jboss instances => the cluster will see three partitions member.
If you create your own partition, you may want to change its name or its multicast address so they don't play together...