How do you change the host name in Hadoop?

2 years ago
Isabella Edwards
2 minutes

To change the hostname of Hadoop, you can follow these steps:

  1. Open all nodes in the Hadoop cluster. Make sure you have administrative privileges.
  2. Edit the /etc/hosts file on each node. In this file, replace the old hostname with the new hostname. You can use a text editor such as vi or nano to open the file for editing. Make sure that the /etc/hosts file on all nodes is modified.
  3. Edit the core-site.xml file in $HADOOP_HOME/etc/hadoop directory. Locate the fs.defaultFS property in the file and change its value to hdfs://newHostName:9000. The new host name should be the one you want to modify. Save and close the file.
  4. Edit the $HADOOP_HOME/etc/hadoop/yarn-site.xml file for Hadoop. Locate the yarn.resourcemanager.hostname property and change its value to the new hostname. Save and close the file.
  5. Edit the $HADOOP_HOME/etc/hadoop/mapred-site.xml file for Hadoop. Locate the mapreduce.jobtracker.hostname property and change its value to the new hostname. Save and close the file.
  6. Edit the $HADOOP_HOME/etc/hadoop/slaves file on all nodes. This file lists all the data nodes and task nodes. Replace the hostname of each node with the new hostname. Save and close the file.
  7. Restart the Hadoop cluster in order for the host name changes to take effect. You can use the following command to restart the cluster:
  8. Execute the stop-all.sh script located in the sbin directory of the Hadoop home directory. Execute the start-all.sh script located in the sbin directory of the Hadoop home directory.
  9. This will halt all Hadoop services and restart them.

After completing the above steps, the hostname of your Hadoop cluster should have been successfully changed.

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