How to set up three Hadoop clusters on Oracle virtual machine using Ubuntu?

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To set up three Hadoop clusters on Oracle virtual machine using Ubuntu, follow the steps below:

1. Download and install Oracle virtual machine onto your computer.
2. Download and install Ubuntu onto three virtual machines in Oracle VM.
3. Connect all three virtual machines onto the same network.
4. Configure the IP addresses for each virtual machine to be unique but within the same subnet.

5. Install Hadoop on each virtual machine by following these steps:

   a. Update the Ubuntu package manager by typing "sudo apt-get update" into the terminal.

   b. Install Java by typing "sudo apt-get install default-jdk" into the terminal.

   c. Download the Hadoop package onto the virtual machines by navigating to the Apache Hadoop website and selecting the appropriate version.

   d. Unpack the downloaded package onto each virtual machine by typing "tar xzf hadoop-X.X.X.tar.gz" into the terminal.

   e. Add the Hadoop binaries to your PATH variable by typing "export PATH=$PATH:/path/to/hadoop-X.X.X/bin" in the terminal.

6. Configure the Hadoop clusters by following these steps:

   a. Edit the "core-site.xml" file by typing "sudo nano ./hadoop-X.X.X/etc/hadoop/core-site.xml" into the terminal on each virtual machine.

   b. Modify the "fs.defaultFS" property to point to the IP address of the virtual machine where the Namenode will run.

   c. Edit the "hdfs-site.xml" file by typing "sudo nano ./hadoop-X.X.X/etc/hadoop/hdfs-site.xml" into the terminal on each virtual machine.

   d. Modify the "dfs.replication" property to match the number of nodes in each cluster (i.e., 3).

   e. Modify the "dfs.namenode.name.dir" property to specify a directory on the local file system where the Namenode should store its metadata.

   f. Modify the "dfs.datanode.data.dir" property to specify a directory on the local file system where the Datanode should store its data.

   g. Edit the "mapred-site.xml" file by typing "sudo nano ./hadoop-X.X.X/etc/hadoop/mapred-site.xml" into the terminal on each virtual machine.

   h. Modify the "mapreduce.framework.name" property to "yarn".

   i. Start the Hadoop services by typing "./sbin/start-dfs.sh" and "./sbin/start-yarn.sh" into the terminal on each virtual machine.

7. Verify that the Hadoop clusters are working correctly by typing "jps" into the terminal on each virtual machine. This should display a list of running Hadoop processes, including the Namenode, Datanode, ResourceManager, and NodeManager.

After following these steps, you should have three fully functioning Hadoop clusters running on Oracle virtual machine using Ubuntu.