Hadoop cluster nodes retired

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1. Creating dfs.hosts.exclude file in the etc / hadoop directory node namenode
   1. vim dfs.hosts.exclude
   2. Add hadoop204 (node ​​to be removed)
2. Modify hdfs-site.xml
   1. vim hdfs-site.xml

   2. Add <property>

          <name>dfs.hosts.exclude</name>

          <value>/opt/module/hadoop-2.7.2/etc/hadoop/dfs.hosts.exclude</value>

      </property>

3. Refresh namenode node
   1. hdfs dfsadmin -refreshNodes
4. By viewing web UI wait to retire node status is closed datanode on that node, nodemanager process after decommissioned
5. Delete retired nodes dfs.hosts file namenode node
6. Once again refresh node
7. Delete retired nodes slaves file namenode node