hadoop - Adding a new Namenode to an existing HDFS cluster -


in hadoop hdfs federation latest step of adding new namenode existing hdfs cluster is:
==> refresh datanodes pickup newly added namenode running following command against datanodes in cluster: 

[hdfs]$ $hadoop_prefix/bin/hdfs dfsadmin -refreshnamenodes <datanode_host_name>:<datanode_rpc_port>

witch best place execute flowing command: namenode or datanode ?
if have 1000 datanodes logical run 1ooo time ?

in namenode run command once.

$hadoop_prefix/sbin/slaves.sh hdfs dfsadmin -refreshnamenodes <datanode_host_name>:<datanode_rpc_port>

slaves.sh script distribute command slave hosts mentioned in slaves file (typically placed in $hadoop_conf_dir)


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