To manage components running on a specific host, choose a FQDN on Hosts Home. For example, choose c6403.ambari.apache.org in the default example shown. Summary- Components lists all components installed on that host.
Choose options in Host Actions, to start, stop, restart, delete, or turn on maintenance mode for all components installed on the selected host.
Alternatively, choose action options from the dropdown next to an individual component on a host. The dropdown shows current operation status for each component, For example, you can restart, stop, decommission, or turn on Maintenance Mode for the DataNode component (started) for HDFS, by selecting one of the following options:
