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I have access to a data node in a Hadoop cluster, and I'd like to find out the identity of the name nodes for the same cluster. Is there a way to do this?

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You can read the configuration file of the datanode, specifically hdfs-site.xml. It will list the namenode that the datanode will try to connect to.

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use below script

#!/bin/bash
date >> list_of_datanodes
bin/hadoop dfsadmin -report > dfsstat.txt
cat dfsstat.txt |grep 'Datanodes available' --color >> list_of_datanodes
cat dfsstat.txt |grep 'Name:' --color >> list_of_datanodes
rm -rf dfsstat.txt
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Recursively deleting the dfsstat.txt files seems like overkill. – chicks Jun 8 at 13:14

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