The rabbitmq-server process definitely wasn't running on node-2. It looks like it went down around 1 minute after node-4 was fenced (00:46). I don't see any rabbitmq server logs in the snapshot though so I can't tell what happened to node-2 at that time. lrmd.log (http://paste.openstack.org/show/485778/) on node-2 has some more information.
The rabbitmq-server process definitely wasn't running on node-2. It looks like it went down around 1 minute after node-4 was fenced (00:46). I don't see any rabbitmq server logs in the snapshot though so I can't tell what happened to node-2 at that time. lrmd.log (http:// paste.openstack .org/show/ 485778/) on node-2 has some more information.