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hdfs_dfsadmin [2016/04/19 00:22] (current) – created - external edit 127.0.0.1
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 +====== 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>

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