What is the method for setting up a pseudo-distributed Hadoop system?
The method for setting up a Hadoop pseudo-distributed environment is as follows:
- To set up Java: Hadoop is written in Java, so it’s necessary to have Java environment installed first.
- Download Hadoop: Get the latest version of Hadoop from the official website and unzip it into a directory.
- Configure Hadoop: Open the configuration files of Hadoop (usually located in the etc/hadoop folder within the extracted directory) and make modifications to the following files:
- hadoop-env.sh: Set the JAVA_HOME variable to the installation path of Java.
- core-site.xml: Configuring the core parameters of Hadoop, such as the file system address, port, etc.
- hdfs-site.xml: Configuring parameters for the Hadoop Distributed File System.
- mapred-site.xml: configuring parameters related to Hadoop’s MapReduce framework.
- Configure parameters related to Hadoop’s resource manager YARN in yarn-site.xml.
- Set up SSH keyless login: Hadoop requires SSH for communication between nodes, so it is necessary to configure keyless login for password-free access between nodes.
- Format the Hadoop file system: Initialize the Hadoop file system by running the format command in the terminal.
- Start Hadoop: Run the startup command in the terminal to initiate the Hadoop cluster.
- Check the status of the cluster: Access Hadoop’s web interface in a browser to view the cluster’s status and task execution.
The above are the basic steps for setting up a Hadoop pseudo-distributed environment, which may vary depending on the specific operating system and version.
