smengcl opened a new pull request #1944:
URL: https://github.com/apache/ozone/pull/1944


   https://issues.apache.org/jira/browse/HDDS-4849
   
   1. Right now running `ozone admin datanode decommission` command alone 
doesn't give any feedback.
   
   With patch:
   
   ```bash
   bash-4.2$ ozone admin datanode decommission
   Incomplete command
   Usage: ozone admin datanode decommission [-hV] [--scm=<scm>] [<hosts>...]
   Decommission a datanode
         [<hosts>...]   List of fully qualified host names
     -h, --help         Show this help message and exit.
         --scm=<scm>    The destination scm (host:port)
     -V, --version      Print version information and exit.
   ```
   
   2. When a decommission command is executed successfully, it lacks feedback 
on the client (it does log on the server side 
   3. though).
   
   With patch:
   
   ```bash
   bash-4.2$ ozone admin datanode decommission 172.18.0.7 172.18.0.2
   Started decommissioning datanode(s):
   172.18.0.7
   172.18.0.2
   ```
   
   3. Improve decommission failure message due to host/port resolution.
   
   With patch:
   
   ```bash
   bash-4.2$ ozone admin datanode decommission 172.18.0.71
   Host 172.18.0.71 (172.18.0.71) is not running any datanodes registered with 
SCM. Please check the host name.
   
   bash-4.2$ ozone admin datanode decommission 172.18.0.7:9999
   Host 172.18.0.7:9999 is running a datanode registered with SCM, but the port 
number doesn't match. Please check the port number.
   ```
   
   Same for recommission and maintenance commands.


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