What are the steps for installing Hadoop on a virtual machine?
The steps to install Hadoop are as follows:
- To install Java: Firstly, you need to install the Java Development Kit (JDK) because Hadoop is built using Java. You can download and install the JDK from either the Oracle website or OpenJDK.
- Download Hadoop: Download the latest version of the Hadoop compressed file from the official Hadoop website and extract it to the specified directory.
- Set up Hadoop environment variables: Edit the Hadoop configuration file to configure environment variables such as JAVA_HOME and HADOOP_HOME.
- Set up a Hadoop cluster: Configure the Hadoop cluster by providing details such as NameNode, DataNode, ResourceManager, NodeManager, etc. in the Hadoop configuration files.
- Format the Hadoop file system: Use the “hadoop namenode -format” command to format the Hadoop file system and create initial directories for the NameNode and DataNode.
- Start the Hadoop cluster: Use the start-all.sh script to start the Hadoop cluster, including starting the NameNode, DataNode, ResourceManager, NodeManager, etc.
- Verify the Hadoop cluster: Check the status of the Hadoop cluster by accessing the Hadoop cluster’s Web UI to ensure that the cluster is running smoothly.
The above are fundamental steps for installing Hadoop, actual operations may vary due to different environments or versions. It is recommended to refer to the official Hadoop documentation or relevant tutorials for guidance.