Should receive an error message when attempting to perform the same successfully command again

I start with a two empty nodes.

If I use the CLI to add a new node and rebalance, i see the following

[root@domU-12-31-36-00-45-D2 py]# python /opt/NorthScale/bin/cli/membase rebalance --cluster=10.253.11.144:8080 --server-add=10.253.30.47:8080
ERROR: Bad Request unable to add server.
rebalance POST response: SUCCESS: rebalance started..

If I execute the command again, it appears to work, but the vbucket state on the two nodes is all wrong. The orginating node show all buckets as active while the joining shows all as a dead

[root@domU-12-31-36-00-45-D2 py]# python /opt/NorthScale/bin/cli/membase rebalance --cluster=10.253.11.144:8080 --server-add=10.253.30.47:8080
SUCCESS: server added..
rebalance POST response: SUCCESS: rebalance started..

[root@domU-12-31-36-00-04-62 tmp]# /opt/NorthScale/1.6.0beta1rc4/bin/ep_engine/management/vbucketctl.py 10.253.11.144:11210 list
vbucket 0 active
vbucket 1 active
vbucket 10 active
vbucket 100 active
vbucket 101 active
...

]# /opt/NorthScale/1.6.0beta1rc4/bin/ep_engine/management/vbucketctl.py 10.253.30.47:11210 listvbucket 0 dead
vbucket 1 dead
vbucket 10 dead
vbucket 100 dead
vbucket 101 dead
vbucket 102 dead