install multihost cluster. on one of the hosts install only HBase RegionServer. Then try to delete the host. after that Ambari ui doesn't work.
Deletion of last host-component should be enabled with the warning.
|Status||Open [ 1 ]||Patch Available [ 10002 ]|
|Status||Patch Available [ 10002 ]||Resolved [ 5 ]|
|Resolution||Fixed [ 1 ]|