Answer / Omprakash

Creating a Hadoop cluster from scratch involves the following steps:
1. Install Java Development Kit (JDK) on all nodes.
2. Set environment variables and configure Hadoop properties in hadoop-env.sh and core-site.xml, hdfs-site.xml, and mapred-site.xml files.
3. Format the NameNode to initialize the HDFS file system.
4. Start the NameNode and JobTracker services.
5. Add DataNodes and TaskTrackers to the cluster.
6. Test the cluster by creating and reading files using Hadoop utilities.

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