could you please be more definitive on your negative experience?
As of the wiping out the cluster from Ambari, do the following:
1. ambari-server stop
2. ambari-server reset
3. ambari-server start
command “reset” wiping out all cluster metadata from the internal database and you can start from scratch.
Also, consider upgrade to Ambari 1.2.1, it have a whole lot of bugs fixed.
check the following document:
When you complete this, do “ambari-server reset”, start the server and all agents.
when login to UI, provide list of the nodes and uncheck “SSH key” checkbox (as you already have all agents installed and running).
Contact us back if you need more information.