The DFSAdmin is a sub-command of the hdfs command line and is used for administering an HDFS cluster.
These are commands that are used only by an HDFS administrator.
dfsadmin is a subcommand of hdfs
| Action | Command |
|---|---|
| Put the cluster in Safemode | hdfs dfsadmin -safemode enter |
| Generate a list of DataNodes | hdfs dfsadmin -report |
| Recommission or decommission DataNode(s) | hdfs dfsadmin -refreshNodes |