====== dfsadmin ======

  * [[Hadoop]]
  * [[HDFS]]

  * [[https://developer.yahoo.com/hadoop/tutorial/module2.html#admincommandref|HDFS dfsadmin Command Reference]]

** Put the cluster in Safemode: **

<code>
hdfs dfsadmin -safemode enter
</code>

** Recommission or decommission DataNode(s): **

<code>
hdfs dfsadmin -refreshNodes
</code>

** Get information about your HDFS filesystem: **

<code>
hdfs dfsadmin -report
</code>

** Check the status of the nodes in the rack **

<code>
hdfs dfsadmin -printTopology
</code>