How can Hadoop be installed?

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Hadoop can be installed by following these basic steps:

1. First, make sure that Java is installed on the system as Hadoop requires it to be installed.
2. Download the latest Hadoop release from the official Apache Hadoop website.
3. Extract the downloaded file to the installation directory on the local system or on a remote server.
4. Configure Hadoop by making changes to the configuration files such as hdfs-site.xml, core-site.xml, mapred-site.xml, and yarn-site.xml. These files are located in the conf directory of Hadoop.
5. Start the Hadoop daemon by executing the start-all.sh script located in the bin directory of Hadoop. This will start all Hadoop services, including HDFS, Yarn, and JobHistoryServer.
6. Test the Hadoop installation by running some sample MapReduce jobs on the Hadoop cluster.

Note: The above steps are based on a single-node installation of Hadoop. For a multi-node installation, additional configuration steps are required.