How can Hadoop be deployed on a single node?

1 year ago
Olivia Parker
2 minutes

The method for deploying Hadoop on a single node is as follows:

  1. Install Java environment: Hadoop depends on the Java environment, so you need to install Java first. You can download the Java version suitable for your operating system from the Oracle official website.
  2. Download Hadoop: Obtain the latest Hadoop binary package (.tar.gz format) from the official Apache website.
  3. Unpack Hadoop: Extract the downloaded Hadoop binary package to a suitable directory.
  4. Set up Hadoop environment variables: add the following line to the .bashrc file, changing the HADOOP_HOME to your Hadoop installation directory.
  5. Set the HADOOP_HOME environment variable to the path where Hadoop is installed and add the Hadoop bin directory to the PATH variable.
  6. After saving the file, execute the following command to make the environment variables take effect:
  7. execute the .bashrc file
  8. Configure Hadoop: Go to the installation directory of Hadoop, locate the hadoop-env.sh file in the conf folder, set the path of JAVA_HOME in it, and point it to your Java installation directory.
  9. Set up the core files of Hadoop: Locate the core-site.xml file in the conf folder and add the following configuration.
  10. fs.defaultFS
    hdfs://localhost:9000
  11. Configure the Hadoop HDFS file system: Locate the hdfs-site.xml file in the conf folder and add the following configuration.
  12. The configuration specifies that the replication factor for the data should be set to 1.
  13. Start Hadoop: Execute the following command to start the Hadoop single node cluster.
  14. Format the HDFS namenode and then start the DFS.
  15. The first command is used to format the NameNode, while the second command is used to start HDFS.
  16. Verify Hadoop: Visit http://localhost:50070 in your browser. If you can see the Hadoop web interface, then the single node deployment of Hadoop was successful.

Please note that the above steps are only applicable for single node deployment and not suitable for distributed cluster deployment in production environments.

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