Use  options to start bulk operations across multiple hosts in your
      cluster.
      Use the Actions UI control to act on
         hosts in your cluster. Actions that you perform that comprise more than one operation,
         possibly on multiple hosts, are also known as bulk operations. The
            Actions control comprises a workflow that uses a sequence of
         three menus to refine your search: a hosts menu, a menu of objects based on your host
         choice, and a menu of actions based on your object choice. For example, if you want to
         restart the RegionServers on any host in your cluster on which a RegionServer
         exists:
      - 
            In the Hosts page, select or search for hosts running a
               RegionServer: 
         
- 
            Using the Actions control, click 
         
- 
            Click OK to start the selected operation.
         
Optionally, monitor background operations to follow,
         diagnose, or troubleshoot the restart operation.