How to view Hadoop cluster data nodes?

2 years ago
Isabella Edwards
1 minute

To view the data nodes in the Hadoop cluster, you can follow these steps:

  1. Log in to the main node (NameNode) of the Hadoop cluster.
  2. Open the terminal window and login to the DataNode using the ssh command. For instance, login to DataNode 1 using the following command:
  3. connect to datanode1 using SSH.
  4. You can use the following commands on the data node to check its status:
  5. Please provide a report with the status of the HDFS filesystem by using the command “hdfs dfsadmin -report.”
  6. This will display all the data nodes in the current cluster along with their status information, such as the nodes’ IP addresses, health status, and used storage capacity.
  7. You can use the following command to view detailed information about the data node:
  8. Retrieve a report on the status of a specific datanode in HDFS using the command “hdfs dfsadmin -datanode -report”.
  9. Here, represents the host name of the data node. This will display detailed information about the specified data node, including data block information, disk usage, network bandwidth, and more.

Please note that the above commands should be executed on the main node of the Hadoop cluster, or by a user account with appropriate permissions.

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